.gitignore

+__pycache__/
\ No newline at end of file

LeoCAD/Scooter.ldr

+0 
+0 Name: New Model.ldr
+0 Author: 
+1 71 180 -48 0 1 0 0 0 1 0 0 0 1 56904.dat
+1 0 180 -48 0 1 0 0 0 1 0 0 0 1 30699.dat
+1 4 260 -57.8657 -50 1 0 0 0 1 0 0 0 1 2730.dat
+1 71 180 -48 -30 0 0 1 0 1 0 -1 0 0 32073.dat
+1 47 180 -48 -30 1 0 0 0 1 0 0 0 1 3713.dat
+1 47 180 -48 -70 1 0 0 0 1 0 0 0 1 3713.dat
+1 71 340 -48 0 1 0 0 0 1 0 0 0 1 56904.dat
+1 0 340 -48 0 1 0 0 0 1 0 0 0 1 30699.dat
+1 71 340 -48 -30 0 0 1 0 1 0 -1 0 0 32073.dat
+1 47 340 -48 -30 1 0 0 0 1 0 0 0 1 3713.dat
+1 47 340 -48 -70 1 0 0 0 1 0 0 0 1 3713.dat
+1 47 220 -128 -70 1 0 0 0 0 1 0 -1 0 40490.dat
+1 47 220 -208 -70 0 0 1 0 1 0 -1 0 0 32073.dat
+1 47 220 -208 -25 -1 0 0 0 1 0 0 0 -1 32123.dat
+1 47 220 -208 -35 -1 0 0 0 1 0 0 0 -1 32123.dat
+1 47 220 -208 -45 -1 0 0 0 1 0 0 0 -1 32123.dat
+1 47 220 -208 -55 -1 0 0 0 1 0 0 0 -1 32123.dat
+1 47 220 -208 -85 -1 0 0 0 1 0 0 0 -1 32123.dat
+1 47 220 -208 -95 -1 0 0 0 1 0 0 0 -1 32123.dat
+1 47 220 -208 -105 -1 0 0 0 1 0 0 0 -1 32123.dat
+1 47 220 -208 -115 -1 0 0 0 1 0 0 0 -1 32123.dat
+1 47 220 -48 -60 0 0 1 0 -1 0 1 0 0 3673.dat

README.md

 # Lerneinheit FAIRe Qualitäts-KPIs
 
 ## Einführung
-Siehe Aufgabenstellung in Moodle.
+Siehe Skript und Aufgabenstellung in [moodle](https://moodle.tu-darmstadt.de/course/view.php?id=36368&section=3#tabs-tree-start).
 
 ## Materialien
-Die Aufgabenstellung im PDF-Format steht in Moodle bereit.
-
 In diesem GitLab Repo finden Sie:
--  Package *functions* (`functions/`): Beinhaltet die Module *classes* und *calculation_rules*
-- Modul classes (`functions/classes.py`): Werkzeuge zum Aufbau und zur Bearbeitung der LEGO Konstruktionen
-- Modul calculation_rules (`functions/calculation_rules.py`): Funktionen zum Berechnen der FAIR Quality KPIs
-- Datenblätter (`datasheets/`): Datenblätter ausgewählter LEGO Komponenten im JSON-Format
-- Jupyter Notebook (`ausarbeitung.ipynb`): Zur Bearbeitung der Aufgaben und Abgabe. Beinhaltet ein Minimalbeispiel zur Verwendung der Werkzeuge.
-
+- Package functions (`functions/`): Beinhaltet die Module `classes` und `calculation_rules`
+- Modul classes (`functions/classes.py`): Werkzeuge zum Aufbau und zur Bearbeitung der LEGO-Konstruktionen
+- Modul calculation_rules (`functions/calculation_rules.py`): Funktionen zum Berechnen der FAIRen
+Qualitäts-KPIs
+- Python-Hilfsdatei (`functions/__init__.py`): Notwendige Datei für die Erzeugung eines Python-Pakets
+- Datenblätter (`datasheets/`): Datenblätter ausgewählter LEGO-Komponenten im JSON-Format
+- Teilebibliothek (`LeoCAD/library.bin`): Teilebibliothek für das Programm LeoCAD
+- Abbildungsordner (`figures`): Ordner zum Ablegen der LeoCAD-Screenshots
+- Beispiel-Notebook (`minimalbeispiel.ipynb`): Einführendes Beispiel zur Verwendung der Werkzeuge
+- Ausarbeitungs-Notebook (`ausarbeitung.ipynb`): Vorlage zur Bearbeitung der Aufgaben und Abgabe
 
 ## Ausarbeitung
 Die Ausarbeitung erfolgt im Notebook `ausarbeitung.ipynb`. In diesem ist bereits eine Gliederung vorgegeben.
 
 ## Abgabe
-Die Abgabe erfolgt über moodle.
+Die Abgabe erfolgt über [moodle](https://moodle.tu-darmstadt.de/mod/assign/view.php?id=1249192). Committen und pushen Sie zunächst Ihre Änderungen auf GitLab und laden Sie von dort Ihr gesamtes Repo als .zip-Datei herunter (ein direkter Download vom JupyterHub ist leider nicht möglich). Benennen Sie die .zip-Datei nach dem folgenden Schema:
+<p style="text-align: center;"> &lt;Nachname&gt;_&lt;Vorname&gt;_&lt;MATR-NR&gt;_&lt;GRUPPEN-NR&gt;_le_1.zip</p>
+
+Abgaben, die diese Namenskonvention nicht erfüllen, können in der Bewertung nicht berücksichtigt werden.
+Laden Sie diese .zip-Datei in moodle hoch. Insbesondere sollten vorhanden sein:
+- Jupyter Notebook mit Erklärungen und Darstellungen von LeoCAD
+- Python-Funktionen für die Berechnung der KPIs
+- Die exportierte(n) JSON-Datei(en) des Fahrzeuges (inkl. der hinzugefügten KPIs)
\ No newline at end of file

ausarbeitung.ipynb

 %% Cell type:markdown id:c9328cd1 tags:
 
 # FAIRe Qualitäts-KPIs
-
-Name:
+Autor:
 Datum:
 
 %% Cell type:markdown id:1c5d41dc tags:
 
 ## Forschungsfrage
-Formulieren Sie eine oder mehrere Forschungsfrage zu der Lerneinheit:
+Formulieren Sie eine oder mehrere Forschungsfragen zu der Lerneinheit:
 
 %% Cell type:markdown id:14e306b5 tags:
 
 
 %% Cell type:markdown id:de070039 tags:
 
 ## Erstes Fahrzeug
 
 %% Cell type:markdown id:531d890a tags:
 
-### Hypothese
-Formulieren Sie eine Hypothese zu diesem ersten Versuch:
+### Versuchsziel
+Formulieren Sie ein Versuchsziel für diesen ersten Versuch:
 
 %% Cell type:markdown id:30ddd8dc tags:
 
 
 %% Cell type:markdown id:50dd9ff3 tags:
 
 ### Versuchsaufbau
 
 Bauen Sie ein erstes Fahrzeug aus den gegebenen LEGO-Teilen in der CAD-Software LeoCAD auf.
 
 Hierbei gelten die folgenden Rahmenbedingungen:
 - Das Fahrzeug muss aus Baugruppen, Bauteilen und Komponenten bestehen.
 - Es muss mindestens vier Räder besitzen
 - Es muss sich durch den elektrischen Antrieb fortbewegen können.
 - Die Verwendung eines Getriebes zwischen Motor und Antriebsachse(n) ist verpflichtend.
 - Die Farbe von mindestens einem Teil soll sich von der in LeoCAD hinterlegten Standardfarbe unterscheiden.
-- Es sind nur die gegebenen LEGO-Teile zu verwenden.
+- Es sind nur die LEGO-Teile zu verwenden, welche sich in den JSON-Dateien bzw. in
+der zur Verfügung gestellten Teilebibliothek befinden.
 
 %% Cell type:markdown id:0ebba2d8 tags:
 
-Fügen Sie eine Abbildung des fertigen Autos in LeoCAD hinzu (*Hinweise: Ein Bild lässt sich mit \!\[Bildbeschreibung](Pfad_zum_Bild) hinzufügen. Achten Sie darauf, das Bild später auch in Git hinzuzufügen*):
+Fügen Sie eine Abbildung des fertigen Autos in LeoCAD hinzu (*Hinweise: Ein Bild lässt sich mit \!\[Bildbeschreibung](/Pfad/zum/Bild) hinzufügen. Achten Sie darauf, das Bild später auch in Git hinzuzufügen*):
 
 %% Cell type:markdown id:935c200c tags:
 
 
 %% Cell type:markdown id:05a8eb21 tags:
 
 Beschreiben Sie kurz und präzise Ihr Fahrzeug:
 
 %% Cell type:markdown id:df7f1d01 tags:
 
 
 %% Cell type:markdown id:e622f83b tags:
 
-Bauen Sie das Fahrzeug nun in unserem Software-Framework zusammen. Insanziieren Sie die LEGO-Teile und lesen Sie dabei auch die Eigenschaften ein. Ergänzen Sie zusätzliche Eigenschaften, wie z.B. die Farbe. Referenzieren Sie die Teile aufeinander und erstellen Sie auf diese Weise sinnvolle Bauteile, Baugruppen und das
+Bauen Sie das Fahrzeug nun in unserem Software-Framework zusammen. Instanziieren Sie die LEGO-Teile und lesen Sie dabei auch die Eigenschaften ein. Ergänzen Sie zusätzliche Eigenschaften, wie z.B. die Farbe. Referenzieren Sie die Teile aufeinander und erstellen Sie auf diese Weise sinnvolle Bauteile, Baugruppen und das
 Gesamtsystem. Nutzen Sie die hierfür bereitgestellten Klassendefinitionen und Methoden. Achten Sie auf eine gute Code-Dokumentation. Sie können sich für die Bearbeitung an den zur Verfügung gestellten Code-Zellen orientieren, können hiervon jedoch auch abweichen.
 
 *Hinweise: Achten Sie auf die Unterschiede zum Minimalbeispiel. Eine direkte Kopie ist nicht möglich. Achten Sie außerdem darauf, ein Teil (eindeutig identifiziert durch seine UUID) nicht an mehreren Stellen zu verbauen*
 
+%% Cell type:code id:690da270 tags:
+
+``` python
+import json
+import pprint
+from functions import calculation_rules
+from functions.classes import *
+```
+
 %% Cell type:code id:ccaf3043 tags:
 
 ``` python
-# initialize componentens
+# initialize components
 ```
 
 %% Cell type:code id:36f981df tags:
 
 ``` python
 # set properties
 ```
 
 %% Cell type:code id:da2d141c tags:
 
 ``` python
 # aggregate components
 ```
 
 %% Cell type:markdown id:c1fef7f0 tags:
 
 ### Analyse
 Bestimmen Sie die Qualität Ihres Fahrzeugs mittels KPIs.
 Die Qualität des Fahrzeugs ist mit mindestens einem KPI je Qualitätsdimension (Aufwand, Verfügbarkeit, Akzeptanz) zu bestimmen. Enwickeln Sie zunächst sinnvolle KPIs, welche mit den gegebenen Daten umsetzbar sind. Halten Sie die Berechnungsvorschriften im Jupyter Notebook fest. Implementieren Sie deren Berechnung für das Gesamtsystem "Fahrzeug" mittels einzelner Funktionen im Skript `calculation_rules`. Sie können zusätzlich Ihre Methoden auch auf die niedrigeren Aggregationsebenen anwenden.
 
 %% Cell type:markdown id:d5f02096 tags:
 
 Beschreiben Sie den jeweiligen KPI und geben Sie seine Berechnungsvorschrift an:
 
 %% Cell type:markdown id:a793bce8 tags:
 
 $$
 a = \frac{b}{c} + d
 $$
 
 %% Cell type:markdown id:9a21b4ac tags:
 
 
 %% Cell type:markdown id:e300a005 tags:
 
 
 %% Cell type:markdown id:2aad773a tags:
 
 Halten Sie die berechneten Werte für die KPIs im Notebook
 fest:
 
 %% Cell type:code id:59eabafc tags:
 
 ``` python
 # calculate the KPIs for your car
 ```
 
 %% Cell type:code id:c774b381 tags:
 
 ``` python
 # print your KPIs
 ```
 
 %% Cell type:markdown id:b89e8fb9 tags:
 
-Exportieren Sie schließlich ihr entworfenes Fahrzeug inklusive der entwickelten KPI:
+Exportieren Sie schließlich Ihr entworfenes Fahrzeug inklusive der entwickelten KPIs:
 
 %% Cell type:code id:d518275f tags:
 
 ``` python
 # export car and its properties
 ```
 
 %% Cell type:markdown id:89c75440 tags:
 
 ## Zweites Fahrzeug
 
 %% Cell type:markdown id:f8a2e1b0 tags:
 
-### Hypothese
+### Versuchsziel
 
 %% Cell type:markdown id:80407e7f tags:
 
 Setzen Sie sich ein Ziel, welche Qualitätsdimensionen in einem zweiten Fahrzeug verbessert werden sollen und bauen
 Sie darauf aufbauend ein zweites Fahrzeug aus den gegebenen LEGO-Teilen auf.
 Die Anforderungen an das Fahrzeug sind identisch zum ersten. Wählen Sie die Einzelteile und deren Zusammenspiel entsprechend Ihrer Zielstellung aus.
 
 %% Cell type:markdown id:f4c620ee tags:
 
-Formulieren Sie eine Hypothese zu diesem Versuch:
+Formulieren Sie ein Versuchsziel für diesen Versuch. Beschreiben Sie unter anderem, welche Verbesserung Sie vornehmen möchten:
 
 %% Cell type:markdown id:e3dc7e29 tags:
 
 
-%% Cell type:markdown id:3cef0828 tags:
-
-Beschreiben Sie, welche Verbesserung Sie vornehmen:
-
-%% Cell type:markdown id:00c9d739 tags:
-
-
 %% Cell type:markdown id:73c454f2 tags:
 
 ### Versuchsaufbau
 
 %% Cell type:markdown id:2b381a60 tags:
 
 Fügen Sie eine Abbildung des fertigen Autos in LeoCAD hinzu:
 
 %% Cell type:markdown id:2b6e7f12 tags:
 
 
 %% Cell type:markdown id:23c19009 tags:
 
 Beschreiben Sie kurz und präzise den Aufbau des zweiten Fahrzeugs:
 
 %% Cell type:markdown id:a08bf9cf tags:
 
 
 %% Cell type:markdown id:14011b6f tags:
 
 Erstellen Sie das Fahrzeug in unserem Softwareframework:
 
 %% Cell type:code id:c35de753 tags:
 
 ``` python
-# initialize componentens
+# initialize components
 ```
 
 %% Cell type:code id:0b7336fb tags:
 
 ``` python
 # set properties
 ```
 
 %% Cell type:code id:fb445ea0 tags:
 
 ``` python
 # aggregate components
 ```
 
 %% Cell type:markdown id:89e54480 tags:
 
 ### Analyse
-Bestimmen Sie die KPIs des zweiten Fahrzeuges
+Bestimmen Sie die KPIs des zweiten Fahrzeugs
 
 %% Cell type:code id:762a1e93 tags:
 
 ``` python
 # calculate the KPIs for your car
 ```
 
 %% Cell type:code id:1ed67328 tags:
 
 ``` python
 # print your KPIs
 ```
 
 %% Cell type:markdown id:0f11b370 tags:
 
-Exportieren Sie ihr Fahrzeug inklusive der KPIs:
+Exportieren Sie Ihr Fahrzeug inklusive der KPIs:
 
 %% Cell type:code id:05d9d6f7 tags:
 
 ``` python
 # export car and its properties
 ```
 
 %% Cell type:markdown id:e413cd84 tags:
 
-## Bewertung
+## Diskussion
 ### Ergebnisse
 Stellen Sie die entwickelten KPIs beider Fahrzeuge gegenüber und wählen Sie hierfür unter anderem eine geeignete
 grafische Darstellung. Stellen Sie dabei insbesondere sicher, dass die Datengrundlage ersichtlich ist. Halten Sie
 auch die Plotbefehle im Notebook fest:
 
 %% Cell type:code id:b0f93e22 tags:
 
 ``` python
 # plot the data, save diagramm as svg-file
 ```
 
 %% Cell type:markdown id:6044de27 tags:
 
-Interpretieren Sie ihre Ergebnisse. Vergleichen Sie die KPIs ihrer Autos. Konnten Sie ihre gewünschte Verbesserung erzielen? Welche Schlüsse ziehen Sie aus den Ergebnissen für die Qualität der beiden
+Interpretieren Sie Ihre Ergebnisse. Vergleichen Sie die KPIs Ihrer Autos. Konnten Sie Ihre gewünschte Verbesserung erzielen? Welche Schlüsse ziehen Sie aus den Ergebnissen für die Qualität der beiden
 Fahrzeuge?
 
 %% Cell type:markdown id:0ca884b1 tags:
 
 
 %% Cell type:markdown id:4f117169 tags:
 
-Diskutieren Sie, inwieweit Ihre entickelten KPIs die im Skript erläuterten FAIR-Prinzipien erfüllen:
+Diskutieren Sie, inwieweit Ihre entwickelten KPIs die im Skript erläuterten FAIR-Prinzipien erfüllen:
 
 %% Cell type:markdown id:f8ed82d2 tags:
 
 
+%% Cell type:markdown id:bfed164a tags:
+
+## Fazit
+
 %% Cell type:markdown id:5d440f87 tags:
 
 Ziehen Sie ein persönliches Fazit. Was haben Sie Neues gelernt?
 
 %% Cell type:markdown id:b4151784 tags:
 

datasheets/README.md

-# Hinweise zu Teilenummern in LeoCAD
-
-Einige Teile der `.json`-Dateien lassen sich nicht direkt in der Standardbibliothek von LeoCAD wiederfinden. Diese sind dort mit abweichenden Nummern hinterlegt. Auf den Raspberry Pis wurden die von uns verwendeten Teilnummern nachgetragen und lassen sich daher wie erwartet auffinden. Falls Sie LeoCAD auf Ihrem eigenen Rechner verwenden, beachten Sie die folgenden Korrespondenztabellen:
-
-Batterien:
-
-Teilnummer `.json`-Datei | Teilnummer LeoCAD
--------------------------|------------------
-8878-1                   | 84599
-8881-1                   | 58119
-88000-1                  | 64228
-
-Motoren:
-
-Teilnummer `.json`-Datei | Teilnummer LeoCAD
--------------------------|------------------
-8882-1                   | 58121
-8883-1                   | 58120
-88003-1                  | 99499
-
-Räder:
-
-Teilnummer `.json`-Datei | Teilnummer(n) LeoCAD
--------------------------|-------------------------------
-4265cc01                 | 32123a (Felge), 59895 (Reifen)
-56904c02                 | 56904 (Felge), 30699 (Reifen)
-41896c04                 | 41896c01
-2903c02                  | 2903 (Felge), 6596 (Reifen)
\ No newline at end of file

datasheets/axles.json

@@ -5,8 +5,9 @@
         "category":"axle",
         "price [Euro]":0.001,
         "mass [g]":0.66,
+        "environmental impact [kg CO2e /kg]":11.03,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32073#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32073",
         "dimension [studs]":5
     },
     "44294":{
@@ -15,8 +16,9 @@
         "category":"axle",
         "price [Euro]":0.01,
         "mass [g]":1.05,
+        "environmental impact [kg CO2e /kg]":11.03,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=44294#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=44294",
         "dimension [studs]":7
     },
     "3707":{
@@ -25,8 +27,9 @@
         "category":"axle",
         "price [Euro]":0.01,
         "mass [g]":1.18,
+        "environmental impact [kg CO2e /kg]":11.03,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3707#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3707",
         "dimension [studs]":8
     },
     "60485":{
@@ -35,8 +38,9 @@
         "category":"axle",
         "price [Euro]":0.01,
         "mass [g]":1.3,
+        "environmental impact [kg CO2e /kg]":11.03,
         "delivery time [days]":7,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=60485#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=60485",
         "dimension [studs]":9
     },
     "3737":{
@@ -45,8 +49,9 @@
         "category":"axle",
         "price [Euro]":0.01,
         "mass [g]":1.49,
+        "environmental impact [kg CO2e /kg]":11.03,
         "delivery time [days]":7,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3737#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3737",
         "dimension [studs]":10
     },
     "23948":{
@@ -55,8 +60,9 @@
         "category":"axle",
         "price [Euro]":0.15,
         "mass [g]":1.65,
+        "environmental impact [kg CO2e /kg]":11.03,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=23948#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=23948",
         "dimension [studs]":11
     },
     "3708":{
@@ -65,8 +71,9 @@
         "category":"axle",
         "price [Euro]":0.02,
         "mass [g]":1.82,
+        "environmental impact [kg CO2e /kg]":11.03,
         "delivery time [days]":7,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3708#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3708",
         "dimension [studs]":12
     },
     "50451":{
@@ -75,8 +82,9 @@
         "category":"axle",
         "price [Euro]":0.75,
         "mass [g]":2.37,
+        "environmental impact [kg CO2e /kg]":11.03,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=50451#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=50451",
         "dimension [studs]":16
     }
 }
\ No newline at end of file

datasheets/batteries.json

 {
-    "8878-1":{
-        "item number":"8878-1",
-        "item description":"Power Functions Rechargeable Battery Box",
-        "category":"battery",
-        "price [Euro]":55,
-        "mass [g]":83.94,
-        "delivery time [days]":8,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?S=8878-1#T=S&O={%22iconly%22:0}",
-        "output voltage [V]":7.4,
-        "dimensions [cm]":"15 x 15 x 3,5"
-    },
     "8881-1":{
         "item number":"8881-1",
         "item description":"Power Functions Battery Box",
         "category":"battery",
+        "related items":"8882-1, 8883-1, 88003-1",
         "price [Euro]":12,
         "mass [g]":179.4,
+        "environmental impact [kg CO2e /kg]":6.95,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?S=8881-1#T=S&O={%22iconly%22:0}",
-        "output voltage [V]":9.0,
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?S=8881-1",
+        "output voltage [V]":9,
         "dimensions [cm]":"8,8 x 6,3 x 3,2"
-    },
-    "88000-1":{
-        "item number":"88000-1",
-        "item description":"Lego AAA Battery Box",
-        "category":"battery",
-        "price [Euro]":30,
-        "mass [g]":97.24,
-        "delivery time [days]":6,
-        "data source":"https://www.brickowl.de/catalog/lego-aaa-battery-box-set-88000",
-        "output voltage [V]":9.0,
-        "dimensions [cm]":"15,3 x 15,1 x 3,9"
-    },
-    "2847c01":{
-        "item number":"2847c01",
-        "item description":"Electric 9V Battery Box",
-        "category":"battery",
-        "price [Euro]":2,
-        "mass [g]":172.7,
-        "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=2847c01&name=Electric%209V%20Battery%20Box%204%20x%2014%20x%204%20with%20Red%20Buttons%20and%20Contact%20Plate%20with%20Dark%20Gray%20Base%20(2846%20/%202847c00)&category=%5BElectric,%20Battery%20Box%5D#T=S&O={%22iconly%22:0}",
-        "output voltage [V]":9.0,
-        "dimensions [cm]":"11,2 x 3,2 x 3,2"
-    },
-}
+    }
+}
\ No newline at end of file

datasheets/frame.json

@@ -5,8 +5,9 @@
         "category":"frame",
         "price [Euro]":2.19,
         "mass [g]":12.96,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=39790#T=C",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=39790",
         "dimension [studs]":"11 x 15 x 1"
     },
     "32532":{
@@ -15,8 +16,9 @@
         "category":"frame",
         "price [Euro]":0.18,
         "mass [g]":8.0,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32532#T=C",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32532",
         "dimension [studs]":"6 x 8 x 1"
     },
     "32531":{
@@ -25,8 +27,9 @@
         "category":"frame",
         "price [Euro]":0.1,
         "mass [g]":5.0,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32531&idColor=11#T=C&C=11",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32531",
         "dimension [studs]":"4 x 6 x 1"
     },
     "3700":{
@@ -35,8 +38,9 @@
         "category":"frame",
         "price [Euro]":0.01,
         "mass [g]":0.82,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3700#T=C",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3700",
         "dimension [studs]":"1 x 2"
     },
     "3701":{
@@ -45,8 +49,9 @@
         "category":"frame",
         "price [Euro]":0.01,
         "mass [g]":1.46,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3701#T=C",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3701",
         "dimension [studs]":"1 x 4 x 1"
     },
     "3702":{
@@ -55,8 +60,9 @@
         "category":"frame",
         "price [Euro]":0.01,
         "mass [g]":2.85,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":5,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3702#T=C",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3702",
         "dimension [studs]":"1 x 8 x 1"
     },
     "2730":{
@@ -65,8 +71,9 @@
         "category":"frame",
         "price [Euro]":0.01,
         "mass [g]":3.67,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":5,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=2730#T=C",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=2730",
         "dimension [studs]":"1 x 10 x 1"
     },
     "3895":{
@@ -75,8 +82,9 @@
         "category":"frame",
         "price [Euro]":0.03,
         "mass [g]":4.2,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":5,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3895#T=C",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3895",
         "dimension [studs]":"1 x 12 x 1"
     },
     "32018":{
@@ -85,8 +93,9 @@
         "category":"frame",
         "price [Euro]":0.03,
         "mass [g]":4.92,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":5,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32018#T=C",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32018",
         "dimension [studs]":"1 x 14 x 1"
     },
     "3703":{
@@ -95,8 +104,9 @@
         "category":"frame",
         "price [Euro]":0.07,
         "mass [g]":5.87,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":5,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3703#T=C",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3703",
         "dimension [studs]":"1 x 16 x 1"
     },
     "32524":{
@@ -105,8 +115,9 @@
         "category":"frame",
         "price [Euro]":0.01,
         "mass [g]":1.79,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32524&name=Technic,%20Liftarm%20Thick%201%20x%207&category=%5BTechnic,%20Liftarm%5D#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32524",
         "dimension [studs]":"1 x 7"
     },
     "40490":{
@@ -115,18 +126,20 @@
         "category":"frame",
         "price [Euro]":0.02,
         "mass [g]":2.59,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=40490&name=Technic,%20Liftarm%20Thick%201%20x%209&category=%5BTechnic,%20Liftarm%5D#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=40490",
         "dimension [studs]":"1 x 9"
     },
-    "32525":{
-        "item number":32525,
+    "64290":{
+        "item number":64290,
         "item description":"Technic, Liftarm Thick 1 x 11",
         "category":"frame",
         "price [Euro]":0.02,
         "mass [g]":2.8,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32525&name=Technic,%20Liftarm%20Thick%201%20x%2011&category=%5BTechnic,%20Liftarm%5D#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32525",
         "dimension [studs]":"1 x 11"
     },
     "41239":{
@@ -135,8 +148,9 @@
         "category":"frame",
         "price [Euro]":0.05,
         "mass [g]":3.3,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":5,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=41239&name=Technic,%20Liftarm%20Thick%201%20x%2013&category=%5BTechnic,%20Liftarm%5D#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=41239",
         "dimension [studs]":"1 x 13"
     },
     "32278":{
@@ -145,8 +159,9 @@
         "category":"frame",
         "price [Euro]":0.05,
         "mass [g]":4.0,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32278&name=Technic,%20Liftarm%20Thick%201%20x%2015&category=%5BTechnic,%20Liftarm%5D#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32278",
         "dimension [studs]":"1 x 15"
     },
     "3713":{
@@ -155,8 +170,9 @@
         "category":"frame",
         "price [Euro]":0.01,
         "mass [g]":0.14,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3713&name=Technic%20Bush&category=%5BTechnic%5D#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3713",
         "dimension [studs]":1
     },
     "32123":{
@@ -165,8 +181,9 @@
         "category":"frame",
         "price [Euro]":0.01,
         "mass [g]":0.01,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=4265c&name=Technic%20Bush%201/2%20Smooth&category=%5BTechnic%5D#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=4265c",
         "dimension [studs]":1
     },
     "3749":{
@@ -175,48 +192,31 @@
         "category":"frame",
         "price [Euro]":0.01,
         "mass [g]":0.22,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":5,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3749&name=Technic,%20Axle%20%201L%20with%20Pin%20without%20Friction%20Ridges&category=%5BTechnic,%20Axle%5D#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3749",
         "dimension [studs]":"0,75 x 2 x 0,55"
     },
-    "6538":{
-        "item number":6538,
-        "item description":"Technic, Axle Connector 2L (Ridged Undetermined Type)",
-        "category":"frame",
-        "price [Euro]":0.03,
-        "mass [g]":0.4,
-        "delivery time [days]":5,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=6538#T=C",
-        "dimension [studs]":"?"
-    },
     "6536":{
         "item number":6536,
         "item description":"Technic, Axle and Pin Connector Perpendicular",
         "category":"frame",
         "price [Euro]":0.01,
         "mass [g]":0.39,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":7,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=6536&name=Technic,%20Axle%20and%20Pin%20Connector%20Perpendicular&category=%5BTechnic,%20Connector%5D#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=6536",
         "dimension [studs]":"1x 2 x 1"
     },
-    "32138":{
-        "item number":32138,
-        "item description":"Technic, Pin Double with Axle Hole",
-        "category":"frame",
-        "price [Euro]":0.01,
-        "mass [g]":0.96,
-        "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32138&name=Technic,%20Pin%20Double%20with%20Axle%20Hole&category=%5BTechnic,%20Pin%5D#T=S&O={%22iconly%22:0}",
-        "dimension [studs]":"?"
-    },
     "14720":{
         "item number":14720,
         "item description":"Technic, Liftarm, Modified H-Shape Thick 3 x 5 Perpendicular",
         "category":"frame",
         "price [Euro]":0.08,
         "mass [g]":2.29,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=14720&name=Technic,%20Liftarm,%20Modified%20H-Shape%20Thick%203%20x%205%20Perpendicular&category=%5BTechnic,%20Liftarm%5D#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=14720",
         "dimension [studs]":"3 x 5 x 1"
     },
     "48989":{
@@ -225,8 +225,9 @@
         "category":"frame",
         "price [Euro]":0.01,
         "mass [g]":1.22,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":5,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=48989&name=Technic,%20Pin%20Connector%20Perpendicular%203L%20with%204%20Pins&category=%5BTechnic,%20Connector%5D#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=48989",
         "dimension [studs]":"3 x 3 x 1"
     },
     "55615":{
@@ -235,8 +236,9 @@
         "category":"frame",
         "price [Euro]":0.1,
         "mass [g]":1.9,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":5,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=55615&name=Technic,%20Pin%20Connector%20Perpendicular%203%20x%203%20Bent%20with%204%20Pins&category=%5BTechnic,%20Connector%5D#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=55615",
         "dimension [studs]":"4 x 4 x 1"
     },
     "32556":{
@@ -245,8 +247,9 @@
         "category":"frame",
         "price [Euro]":0.1,
         "mass [g]":0.25,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32556&name=Technic,%20Pin%203L%20without%20Friction%20Ridges&category=%5BTechnic,%20Pin%5D#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32556",
         "dimension [studs]":1
     },
     "3673":{
@@ -255,8 +258,9 @@
         "category":"frame",
         "price [Euro]":0.01,
         "mass [g]":0.16,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3673&name=Technic,%20Pin%20without%20Friction%20Ridges&category=%5BTechnic,%20Pin%5D#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3673",
         "dimension [studs]":1
     },
     "32054":{
@@ -265,8 +269,9 @@
         "category":"frame",
         "price [Euro]":0.01,
         "mass [g]":0.33,
+        "environmental impact [kg CO2e /kg]":11.93,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32054&name=Technic,%20Pin%203L%20with%20Friction%20Ridges%20and%20Stop%20Bush&category=%5BTechnic,%20Pin%5D#T=S&O={%22iconly%22:0}",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32054",
         "dimension [studs]":1
     }
 }
\ No newline at end of file

datasheets/gears.json

 {
-    "3647":{
-        "item number":3647,
-        "item description":"Gear 8 Tooth",
+    "6589":{
+        "item number":6589,
+        "item description":"Gear 12 Tooth Bevel",
         "category":"gear",
-        "price [Euro]":0.14,
-        "mass [g]":0.16,
+        "price [Euro]":0.01,
+        "mass [g]":0.29,
+        "environmental impact [kg CO2e /kg]":32.06,
+        "delivery time [days]":12,
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=6589"
+    },
+    "10928":{
+        "item number":10928,
+        "item description":"Gear 8 Tooth with Dual Face",
+        "category":"gear",
+        "price [Euro]":0.01,
+        "mass [g]":0.22,
+        "environmental impact [kg CO2e /kg]":32.06,
         "delivery time [days]":11,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3647#T=C"
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=10928"
     },
     "94925":{
         "item number":94925,
@@ -14,44 +25,39 @@
         "category":"gear",
         "price [Euro]":0.2,
         "mass [g]":0.7,
+        "environmental impact [kg CO2e /kg]":32.06,
         "delivery time [days]":12,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=94925#T=C"
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=94925"
     },
-    "32269":{
-        "item number":32269,
-        "item description":"Gear 20 Tooth",
+    "18575":{
+        "item number":18575,
+        "item description":"Gear 20 Tooth Double Bevel",
         "category":"gear",
         "price [Euro]":0.36,
         "mass [g]":1.4,
+        "environmental impact [kg CO2e /kg]":32.06,
         "delivery time [days]":13,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32269#T=C"
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32269"
     },
-    "3648":{
-        "item number":3648,
+    "24505":{
+        "item number":24505,
         "item description":"Gear 24 Tooth",
         "category":"gear",
         "price [Euro]":0.32,
         "mass [g]":1.17,
+        "environmental impact [kg CO2e /kg]":32.06,
         "delivery time [days]":11,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3648#T=C"
-    },
-    "3650":{
-        "item number":3650,
-        "item description":"Gear 24 Tooth Crown",
-        "category":"gear",
-        "price [Euro]":0.09,
-        "mass [g]":1.03,
-        "delivery time [days]":13,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3650#T=C"
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3648"
     },
-    "3649":{
-        "item number":3649,
+    "34432":{
+        "item number":34432,
         "item description":"Gear 40 Tooth",
         "category":"gear",
         "price [Euro]":0.81,
         "mass [g]":3.76,
+        "environmental impact [kg CO2e /kg]":32.06,
         "delivery time [days]":11,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3649#T=C"
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3649"
     },
     "32498":{
         "item number":32498,
@@ -59,8 +65,9 @@
         "category":"gear",
         "price [Euro]":0.88,
         "mass [g]":3.5,
+        "environmental impact [kg CO2e /kg]":32.06,
         "delivery time [days]":12,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32498#T=C"
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=32498"
     },
     "6588":{
         "item number":6588,
@@ -68,6 +75,7 @@
         "category":"gear",
         "price [Euro]":1.63,
         "mass [g]":4.5,
+        "environmental impact [kg CO2e /kg]":32.06,
         "delivery time [days]":11,
         "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=6588#T=C"
     },
@@ -77,6 +85,7 @@
         "category":"gear",
         "price [Euro]":0.54,
         "mass [g]":0.6,
+        "environmental impact [kg CO2e /kg]":32.06,
         "delivery time [days]":12,
         "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=4716#T=C"
     }

datasheets/motors.json

@@ -3,15 +3,15 @@
         "item number":"8882-1",
         "item description":"Power Functions XL-Motor",
         "category":"motor",
-        "related items":8881,
+        "related items":"8881-1",
         "idle current [mA]":80,
         "idle speed [rev per min]":220,
         "locking torque [Ncm]":40,
         "price [Euro]":30,
         "mass [g]":72.85,
+        "environmental impact [kg CO2e /kg]":15.84,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?S=8882-1&name=Power%20Functions%20XL-Motor&category=%5BPower%20Functions%5D#T=S&O={%22iconly%22:0}",
-        "compatible battery":8881,
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?S=8882-1",
         "input voltage [V]":9,
         "dimensions [cm]":"13.6 x 12.2 x 3.9"
     },
@@ -19,15 +19,15 @@
         "item number":"8883-1",
         "item description":"Power Functions M-Motor",
         "category":"motor",
-        "related items":"8881, 8878, 45517, 88000",
+        "related items":"8881-1",
         "idle current [mA]":65,
         "idle speed [rev per min]":405,
         "locking torque [Ncm]":11,
         "price [Euro]":20,
         "mass [g]":35.0,
+        "environmental impact [kg CO2e /kg]":15.84,
         "delivery time [days]":5,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?S=8883-1&name=Power%20Functions%20M-Motor&category=%5BPower%20Functions%5D#T=S&O={%22iconly%22:0}",
-        "compatible battery":"8881, 8878, 45517, 88000",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?S=8883-1",
         "input voltage [V]":9,
         "dimensions [cm]":"13.8 x 11.9 x 2.3"
     },
@@ -35,15 +35,15 @@
         "item number":"88003-1",
         "item description":"Power Functions L-Motor",
         "category":"motor",
-        "related items":"8881, 8878, 88000",
+        "related items":"8881-1",
         "idle current [mA]":120,
         "idle speed [rev per min]":390,
         "locking torque [Ncm]":18,
         "price [Euro]":15,
         "mass [g]":48.0,
+        "environmental impact [kg CO2e /kg]":15.84,
         "delivery time [days]":3,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?S=88003-1&name=Power%20Functions%20L-Motor&category=%5BPower%20Functions%5D#T=S&O={%22iconly%22:0}",
-        "compatible battery":"8881, 8878, 88000",
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?S=88003-1",
         "input voltage [V]":9,
         "dimensions [cm]":"13 x 11 x 2.5"
     }

datasheets/rims.json

+{
+    "3482":{
+        "item number":3482,
+        "item description":"Wheel with Split Axle Hole",
+        "category":"rim",
+        "related items":3483,
+        "diameter [mm]":17.5,
+        "price [Euro]":0.01,
+        "mass [g]":0.88,
+        "environmental impact [kg CO2e /kg]":32.06,
+        "delivery time [days]":5,
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3482"
+    },
+    "6014":{
+        "item number":6014,
+        "item description":"Wheel 11mm D. x 12mm, Hole Round for Wheels Holder Pin",
+        "category":"rim",
+        "related items":6015,
+        "diameter [mm]":11.0,
+        "price [Euro]":0.0045,
+        "mass [g]":0.6,
+        "environmental impact [kg CO2e /kg]":32.06,
+        "delivery time [days]":5,
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=6014a"
+    },
+    "18976":{
+        "item number":18976,
+        "item description":"Wheel 18mm D. x 12mm with Axle Hole and Stud, Solid Brake Rotor Lines",
+        "category":"rim",
+        "related items":30391,
+        "diameter [mm]":18.0,
+        "price [Euro]":0.01,
+        "mass [g]":1.4,
+        "environmental impact [kg CO2e /kg]":32.06,
+        "delivery time [days]":5,
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=18976"
+    },
+    "56904":{
+        "item number":56904,
+        "item description":"Wheel 30mm D. x 14mm",
+        "category":"rim",
+        "related items":30699,
+        "diameter [mm]":30.0,
+        "price [Euro]":0.01,
+        "mass [g]":4.1,
+        "environmental impact [kg CO2e /kg]":32.06,
+        "delivery time [days]":5,
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=56904"
+    },
+    "56908":{
+        "item number":56908,
+        "item description":"Wheel 43.2mm D. x 26mm Technic Racing Small, 6 Pin Holes",
+        "category":"rim",
+        "related items":"41897, 61480",
+        "diameter [mm]":43.2,
+        "price [Euro]":0.05,
+        "mass [g]":9.0,
+        "environmental impact [kg CO2e /kg]":32.06,
+        "delivery time [days]":5,
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=56908"
+    }
+}
\ No newline at end of file

datasheets/tires.json

+{
+    "3483":{
+        "item number":3483,
+        "item description":"Tire 24mm D. x 8mm Offset Tread - Interior Ridges",
+        "category":"tire",
+        "related items":3482,
+        "inner diameter [mm]":17,
+        "outer diameter [mm]":24.0,
+        "price [Euro]":0.0025,
+        "mass [g]":1.69,
+        "environmental impact [kg CO2e /kg]":8.97,
+        "delivery time [days]":5,
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3483"
+    },
+    "6015":{
+        "item number":6015,
+        "item description":"Tire 21mm D. x 12mm - Offset Tread Small Wide",
+        "category":"tire",
+        "related items":6014,
+        "inner diameter [mm]":11,
+        "outer diameter [mm]":21.0,
+        "price [Euro]":0.0004,
+        "mass [g]":2.0,
+        "environmental impact [kg CO2e /kg]":8.97,
+        "delivery time [days]":5,
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=6015"
+    },
+    "30391":{
+        "item number":30391,
+        "item description":"Tire 30.4 x 14 Offset Tread",
+        "category":"tire",
+        "related items":18976,
+        "inner diameter [mm]":17,
+        "outer diameter [mm]":30.4,
+        "price [Euro]":0.0027,
+        "mass [g]":6.5,
+        "environmental impact [kg CO2e /kg]":8.97,
+        "delivery time [days]":5,
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=30391"
+    },
+    "30699":{
+        "item number":30699,
+        "item description":"Tire 43.2 x 14 Solid",
+        "category":"tire",
+        "related items":56904,
+        "inner diameter [mm]":30,
+        "outer diameter [mm]":43.2,
+        "price [Euro]":0.06,
+        "mass [g]":8.25,
+        "environmental impact [kg CO2e /kg]":8.97,
+        "delivery time [days]":5,
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=30699"
+    },
+    "41897":{
+        "item number":41897,
+        "item description":"Tire 56 x 28 ZR Street",
+        "category":"tire",
+        "related items":56908,
+        "inner diameter [mm]":43,
+        "outer diameter [mm]":56.0,
+        "price [Euro]":0.29,
+        "mass [g]":13.98,
+        "environmental impact [kg CO2e /kg]":8.97,
+        "delivery time [days]":5,
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=41897"
+    },
+    "61480":{
+        "item number":61480,
+        "item description":"Tire 68.7 x 34 R",
+        "category":"tire",
+        "related items":56908,
+        "inner diameter [mm]":43,
+        "outer diameter [mm]":68.7,
+        "price [Euro]":0.02,
+        "mass [g]":20.0,
+        "environmental impact [kg CO2e /kg]":8.97,
+        "delivery time [days]":5,
+        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=61480"
+    }
+}
\ No newline at end of file

datasheets/wheels.json

-{
-    "4265cc01":{
-        "item number":"4265cc01",
-        "item description":"wheel 14",
-        "category":"wheel",
-        "related items":59895,
-        "price [Euro]":0.02,
-        "mass [g]":0.5,
-        "delivery time [days]":5,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=4265cc01#T=C",
-        "diameter [mm]":14.0
-    },
-    "3482c01":{
-        "item number":"3482c01",
-        "item description":"wheel 24",
-        "category":"wheel",
-        "related items":3483,
-        "price [Euro]":0.01,
-        "mass [g]":3.0,
-        "delivery time [days]":5,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=3482c01#T=C",
-        "diameter [mm]":24.0
-    },
-    "56904c02":{
-        "item number":"56904c02",
-        "item description":"wheel 43,2",
-        "category":"wheel",
-        "related items":30699,
-        "price [Euro]":0.11,
-        "mass [g]":13.0,
-        "delivery time [days]":5,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=56904c02#T=C",
-        "diameter [mm]":43.2
-    },
-    "41896c04":{
-        "item number":"41896c04",
-        "item description":"wheel 56",
-        "category":"wheel",
-        "related items":41897,
-        "price [Euro]":0.45,
-        "mass [g]":23.0,
-        "delivery time [days]":5,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=41896c04#T=C",
-        "diameter [mm]":56.0
-    },
-    "2903c02":{
-        "item number":"2903c02",
-        "item description":"wheel 81,6",
-        "category":"wheel",
-        "related items":2902,
-        "price [Euro]":1.31,
-        "mass [g]":30.0,
-        "delivery time [days]":5,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=2903c02#T=C",
-        "diameter [mm]":81.6
-    },
-    "88517c01":{
-        "item number":"88517c01",
-        "item description":"wheel 100,6",
-        "category":"wheel",
-        "related items":11957,
-        "price [Euro]":1.25,
-        "mass [g]":40.0,
-        "delivery time [days]":5,
-        "data source":"https://www.bricklink.com/v2/catalog/catalogitem.page?P=88517c02#T=C",
-        "diameter [mm]":100.6
-    }
-}
\ No newline at end of file

functions/calculation_rules.py

@@ -2,42 +2,35 @@
 File consists of several functions for the calculation rules of FAIR Quality KPIs
 """
 
+from functions.classes import *
 
 def test_function():
     """Test function to check module functionality"""
     print("You called the test function.")
 
-
-def kpi_sum(*args):
+def kpi_mass(system: LegoAssembly)->float:
     """
-    Calculates the sum of one or more integers or lists.
+    Calculates the total mass of the system
 
     Args:
-        *args: One or more integers or lists.
+        system (LegoAssembly): LegoAssembly object that represents the system
 
     Returns:
-        total (int): The sum of all given integers and/or the sum
-        of all items in all given lists.
+        total_mass (float): Sum of masses of all components in the system in g
 
     Raises:
         TypeError: If an argument with unsupported type is passed
-            (i.e. anything other than int or list).
+            (i.e. anything other than LegoAssembly).
     """
-    total = 0
-    for arg in args:
-        if isinstance(arg, int):  # Check if argument is an integer
-            total += arg
-        elif isinstance(arg, list):  # Check if argument is a list
-            total += sum(arg)
-        else:
-            raise TypeError(
-                f"Unsupported type {type(arg)} passed to kpi_sum()")
-    return total
-
-    # if arguments are handed over not as a list: sum(list(args))
+    if not isinstance(system, LegoAssembly):
+        raise TypeError(f"Unsupported type {type(system)} passed to kpi_mass()")
 
+    total_mass = 0
+    for c in system.get_component_list(-1):
+        total_mass += c.properties["mass [g]"]
+    return total_mass # alternative: sum(c.properties["mass [g]"] for c in system.get_component_list(-1))
 
-# Add new functions for calculating some real complicated metrics
+# Add new functions for calculating metrics
 
 
 if __name__ == "__main__":

functions/classes.py

@@ -2,18 +2,19 @@
 File consists of several classes to model elements and assembly
 layers of a composed device.
 """
+
 from __future__ import annotations
 import uuid
 import json
 import operator
 from enum import Enum, auto
-from typing import List, Dict, Optional
+from typing import Any, Optional
 from copy import deepcopy
 
 
 class AggregationLayer(Enum):
-    """Describes the levl of aggregation for the objects LegoComponent
-    and LegoAssembly and provides the 4 applicable layers.
+    """Describes the level of aggregation for the objects LegoComponent and LegoAssembly
+    and provides the 4 applicable layers.
     """
 
     SYSTEM = auto()
@@ -23,62 +24,50 @@ class AggregationLayer(Enum):
 
 
 class LegoComponent:
-    """
-    A class for storing information about a single Lego component.
-
-    ...
+    """Information storage for a single Lego component.
 
     Attributes
-    ----------
-    uuid : UUID
-        A randomly generated unique identifier for the component.
-    parent : None | LegoAssembly
-        The parent of the component. Can be either None or a LegoAssembly object.
-    layer : AggregationLayer
-        An enumeration indicating the hierarchy level. For compoennts, this is
-        COMPONENT by default.
-    properties : dict
-        Dictionary that holds all properties of the component that can be saved
-        in a dictionary format.
+        uuid (uuid.UUID): A randomly generated unique identifier for the component.
+        parent (None | LegoAssembly): The parent of the component. None if the
+            component has no parent.
+        layer (AggregationLayer): An enumeration indicating the hierarchy level. For
+            components, this is COMPONENT by default.
+        properties (dict[str, Any]): dictionary that holds all properties of the
+            component that can be saved in a dictionary format.
 
     Methods
-    -------
-    clone(new_label=None)
-        Returns a new instance of LegoComponent identical to the current instance.
-    get_root_assembly()
-        Returns the top-level assembly in which the component belongs.
-    to_dict()
-        Returns the current instance represented as a dictionary.
+        clone(new_label=None): Returns a new instance of LegoComponent identical to the
+            current instance.
+        get_root_assembly(): Returns the top-level assembly in which the component is
+            contained.
+        to_dict(): Returns the current instance represented as a dictionary.
     """
 
     def __init__(
         self,
         label: Optional[str] = None,
-        datasheet: Optional[dict] = None,
+        datasheet: Optional[dict[str, Any]] = None,
         *more_properties: dict,
         **kwargs,
     ) -> None:
-        """
-        Constructs all the necessary attributes for the LegoComponent object.
+        """Create a LegoComponent object.
 
-        Parameters
-        ----------
-            label : str, optional
-                The name of the component to add.
-            datasheet : dict, optional
-                Metadata describing the component, read from datasheet.
-            more_properties : tuple of dict, dict
+        Args:
+            label (str, optional): The name of the component to add. Defaults
+                to None.
+            datasheet (dict[str, Any], optional): Metadata describing the component,
+                read from datasheet. Defaults to None.
+            more_properties (dict[str, Any])
                 Additional dictionaries representing custom properties.
             kwargs
                 Arbitrary keyword arguments representing custom properties.
 
-        Raises
-        ------
-            ValueError
-                If the type of more_properties argument is not a dictionary.
+        Raises:
+            ValueError: If the type of more_properties argument is not a dictionary.
         """
-        self.uuid: uuid.UUID = uuid.uuid4()
-        self.parent: None | LegoAssembly = None
+
+        self._uuid: uuid.UUID = uuid.uuid4()
+        self._parent: None | LegoAssembly = None
         self.layer: AggregationLayer = AggregationLayer.COMPONENT
         self.properties: dict = {}
         if label is not None:
@@ -93,81 +82,137 @@ class LegoComponent:
         for key, value in kwargs.items():
             self.properties[key] = deepcopy(value)
 
+    @property
+    def uuid(self) -> uuid.UUID:
+        return self._uuid
+
+    @property
+    def parent(self) -> None | LegoAssembly:
+        return self._parent
+
     def clone(self, new_label: Optional[str] = None) -> LegoComponent:
-        """
-        Returns a new instance of LegoComponent identical to the current instance.
+        """Return a new instance of LegoComponent identical to the current instance.
 
         This method creates a new instance of LegoComponent that is identical to the
         current instance with an optional different label.
         The assigned uuid changes and elements are copied.
 
-        Parameters
-        ----------
-            new_label : str, optional
-                A new label string to use. Defaults to None.
-
-        Returns
-        -------
-        LegoComponent
-            A new instance of LegoComponent that is identical to the current instance.
+        Args:
+            new_label (str, optional): A new label string to use. Defaults to None.
 
+        Returns:
+            LegoComponent: A new instance of LegoComponent that is identical to the
+                current instance.
         """
+
         if new_label is None:
             new_label = self.properties["label"]
         clone = LegoComponent(None, None, deepcopy(self.properties))
         clone.properties["label"] = new_label
         return clone
 
-    def get_root_assembly(self):
+    def get_property(self, key: str, default: Any = None) -> Any:
+        """Get a property from the component.
+
+        Args:
+            key (str): Property name.
+            default (Any, optional): What to return if key is not available in
+                properties. Defaults to None.
+
+        Returns:
+            Any: Property value.
         """
-        Returns the top-level assembly in which the component belongs.
+        if key == "uuid":
+            return self._uuid
+        if key == "layer":
+            return self._layer
+        return self.properties.get(key, default=default)
+
+    def get_root_assembly(self):
+        """Return the top-level assembly in which the component belongs.
 
         This method traverses the parent hierarchy of a LegoComponent object until it
         finds the root-level LegoAssembly, returning it to the caller. A parent is
         assigned when a LegoComponent or LegoItem is added to a LegoAssembly object.
 
-        Returns
-        -------
-        None | LegoAssembly
-            The root-level LegoAssembly or None if the component has no parent.
+        Returns:
+            None | LegoAssembly: The root-level LegoAssembly or None if the component
+                has no parent.
         """
-        if self.parent is None:
+        if self._parent is None:
             return None
-        current_assembly = self.parent
-        while current_assembly.parent is not None:
-            current_assembly = current_assembly.parent
+        current_assembly = self._parent
+        while current_assembly._parent is not None:
+            current_assembly = current_assembly._parent
         return current_assembly
 
-    def to_dict(self) -> Dict:
-        """
-        Returns the current instance represented as a dictionary.
+    def to_dict(self) -> dict:
+        """Return the current instance represented as a dictionary.
 
         This method returns a dictionary representation of the LegoComponent object
         suitable for serialization as JSON.
 
-        Returns
-        -------
-        dict
-            A dictionary representation of the object.
+        Returns:
+            dict[str, Any]: A dictionary representation of the object.
         """
         dict_ = {
-            "uuid": self.uuid,
+            "uuid": self._uuid,
             "properties": self.properties,
             "layer": self.layer,
         }
         return {"component": dict_}
 
-    def __str__(self):
-        """
-        Simple string representation of the object.
+    def __eq__(self, obj: object):
+        """Check if provided object is equal to this component.
+
+        Args:
+            obj (object): Object to compare to.
+
+        Returns:
+            bool: True if UUID, properties, and layer match. False otherwise.
         """
-        return self.__repr__()
+        # in case of mismatching class
+        if not isinstance(obj, LegoComponent):
+            return False
+
+        if (
+            self._uuid == obj._uuid
+            and self.layer == obj.layer
+            and self.properties == obj.properties
+        ):
+            return True
+        else:
+            return False
 
     def __repr__(self):
+        """Create a machine-readable representation of the instance.
+
+        Returns:
+            str: A string representing the LegoComponent instance.
+        """
+
+        label_str = ""
+        if self.properties["label"] is not None:
+            label_str = f"label='{self.properties['label']}', "
+        property_str = ", ".join(
+            [
+                f"'{k}': '{v}'" if isinstance(v, str) else f"'{k}': {v}"
+                for k, v in self.properties.items()
+                if not k == "label"
+            ]
+        )
+        property_str = f"**{{{property_str}}}" if property_str else property_str
+        return f"LegoComponent({label_str}{property_str})"
+
+    def __str__(self):
+        """Handle the conversion of LegoComponent objects to str objects.
+
+        Returns:
+            str: A string converted from the LegoComponent instance.
         """
-        String representation of the object including the component label and UUID.
-        """
-        return f"LegoComponent {self.properties['label']} [{self.uuid}]"
+        if self.properties.get("label") is None:
+            return f"LegoComponent [{self._uuid}]"
+        return f"LegoComponent {self.properties['label']} [{self._uuid}]"
 
 
 class LegoAssembly:
@@ -179,8 +224,8 @@ class LegoAssembly:
         parent (LegoAssembly or None): The parent assembly containing this one, if any.
         properties (dict): Optional properties for the assembly, such as a label.
         layer (AggregationLayer): The aggregation layer of the assembly.
-        components (List[LegoComponent]): The list of contained components.
-        assemblies (List[LegoAssembly]): The list of contained subassemblies.
+        components (list[LegoComponent]): The list of contained components.
+        assemblies (list[LegoAssembly]): The list of contained subassemblies.
     """
 
     def __init__(
@@ -200,10 +245,10 @@ class LegoAssembly:
             properties (dict): Optional properties for the assembly, such as a label.
             **kwargs: Optional keyword arguments for additional properties.
         """
-        self.uuid: uuid.UUID = uuid.uuid4()
-        self.parent: None | LegoAssembly = None
+        self._uuid: uuid.UUID = uuid.uuid4()
+        self._parent: None | LegoAssembly = None
         self.properties: dict = {}
-        self.layer: AggregationLayer = layer
+        self._layer: AggregationLayer = layer
         if label is not None:
             self.properties["label"] = label
         for prop in properties:
@@ -213,16 +258,36 @@ class LegoAssembly:
                 raise ValueError(f"Unexpected argument type: {type(properties)}")
         for key, value in kwargs.items():
             self.properties[key] = deepcopy(value)
-        self.components: List[LegoComponent] = []
-        self.assemblies: List[LegoAssembly] = []
+        self._components: list[LegoComponent] = []
+        self._assemblies: list[LegoAssembly] = []
+
+    @property
+    def uuid(self) -> uuid.UUID:
+        return self._uuid
+
+    @property
+    def parent(self) -> None | LegoAssembly:
+        return self._parent
+
+    @property
+    def layer(self) -> AggregationLayer:
+        return self._layer
+
+    @property
+    def components(self) -> list[LegoComponent]:
+        return self._components
 
-    def add_component(self, component: LegoComponent | List[LegoComponent]) -> None:
+    @property
+    def assemblies(self) -> list[LegoAssembly]:
+        return self._assemblies
+
+    def add_component(self, component: LegoComponent | list[LegoComponent]) -> None:
         """
         Adds a Lego component to the current assembly.
         Use add() to handle both components and assemblies.
 
         Args:
-            component (LegoComponent or List[LegoComponent]):
+            component (LegoComponent or list[LegoComponent]):
                 The component or list of components to add.
 
         Raises:
@@ -242,22 +307,22 @@ class LegoAssembly:
                 f"got {type(component).__name__} instead."
             )
 
-        if self.get_root_assembly().contains_uuid(component.uuid):
+        if self.get_root_assembly().contains_uuid(component._uuid):
             raise AssertionError(
                 f"This assembly or a subassembly already contains "
                 f"the component with ID "
-                f"{component.uuid}."
+                f"{component._uuid}."
             )
-        component.parent = self
-        self.components.append(component)
+        component._parent = self
+        self._components.append(component)
 
-    def add_assembly(self, assembly: LegoAssembly | List[LegoAssembly]) -> None:
+    def add_assembly(self, assembly: LegoAssembly | list[LegoAssembly]) -> None:
         """
         Adds a subassembly to the current assembly.
         Use add() to handle both components and assemblies.
 
         Args:
-            assembly (LegoAssembly or List[LegoAssembly]):
+            assembly (LegoAssembly or list[LegoAssembly]):
                 The subassembly or list of subassemblies to add.
 
         Raises:
@@ -277,23 +342,23 @@ class LegoAssembly:
                 f"got {type(assembly).__name__} instead."
             )
 
-        if self.get_root_assembly().contains_uuid(assembly.uuid):
+        if self.get_root_assembly().contains_uuid(assembly._uuid):
             raise AssertionError(
                 f"This assembly or a subassembly already contains "
-                f"the assembly with ID {assembly.uuid}."
+                f"the assembly with ID {assembly._uuid}."
             )
-        assembly.parent = self
-        self.assemblies.append(assembly)
+        assembly._parent = self
+        self._assemblies.append(assembly)
 
     def add(
-        self, part: LegoAssembly | LegoComponent | List[LegoAssembly | LegoComponent]
+        self, part: LegoAssembly | LegoComponent | list[LegoAssembly | LegoComponent]
     ) -> None:
         """
         Adds either a Lego component, a subassembly or a (mixed) list of them to the
         current assembly. Uses internal functions add_component() and add_assembly().
 
         Args:
-            part (LegoAssembly or LegoComponent or List[LegoAssembly or LegoComponent]):
+            part (LegoAssembly or LegoComponent or list[LegoAssembly or LegoComponent]):
                 The part or parts to add.
 
         Raises:
@@ -314,7 +379,7 @@ class LegoAssembly:
                 f"Got {type(part).__name__} instead."
             )
 
-    def children(self) -> Dict[str, List[LegoComponent] | List[LegoAssembly]]:
+    def children(self) -> dict[str, list[LegoComponent] | list[LegoAssembly]]:
         """
         Returns a dictionary of the assembly's children (components and
         sub-assemblies), sorted by category.
@@ -323,28 +388,45 @@ class LegoAssembly:
             A dictionary with two keys - "components" and "assemblies" - and
             corresponding lists of LegoComponents and LegoAssemblies as values.
         """
-        return {"components": self.components, "assemblies": self.assemblies}
+        return {"components": self._components, "assemblies": self._assemblies}
 
-    def get_component_list(self, max_depth: int = -1) -> List[LegoComponent]:
+    def get_component_list(self, max_depth: int = -1) -> list[LegoComponent]:
         """
         Gets a full list of all components contained in the assembly or any of
         its sub-assemblies.
 
         Args:
             max_depth: An integer indicating the maximum depth of recursion.
-                -1 means unlimited depth. 0 returns only direc children.
+                -1 means unlimited depth. 0 returns only direct children.
 
         Returns:
             A list of all LegoComponents contained in the current assembly or
             its sub-assemblies.
         """
         component_list = []
-        component_list.extend(self.components)
-        if max_depth > 0 or max_depth < 0:
-            for assembly in self.assemblies:
+        component_list.extend(self._components)
+        if not max_depth == 0:
+            for assembly in self._assemblies:
                 component_list.extend(assembly.get_component_list(max_depth - 1))
         return component_list
 
+    def get_property(self, key: str, default: Any = None) -> Any:
+        """Get a property from the assembly.
+
+        Args:
+            key (str): Property name.
+            default (Any, optional): What to return if key is not available in
+                properties. Defaults to None.
+
+        Returns:
+            Any: Property value.
+        """
+        if key == "uuid":
+            return self._uuid
+        if key == "layer":
+            return self._layer
+        return self.properties.get(key, default=default)
+
     def get_root_assembly(self) -> LegoAssembly:
         """
         Returns the root LegoAssembly of the current assembly by recursively
@@ -354,8 +436,8 @@ class LegoAssembly:
             The root LegoAssembly of the current LegoAssembly instance.
         """
         current_assembly = self
-        while current_assembly.parent is not None:
-            current_assembly = current_assembly.parent
+        while current_assembly._parent is not None:
+            current_assembly = current_assembly._parent
         return current_assembly
 
     def contains_uuid(self, uuid_: uuid.UUID):
@@ -371,18 +453,18 @@ class LegoAssembly:
             True if the UUID exists in the assembly or any of its sub-assemblies,
                 False otherwise.
         """
-        component_ids = list(map(lambda c: c.uuid, self.components))
+        component_ids = list(map(lambda c: c._uuid, self._components))
         if uuid_ in component_ids:
             return True
-        assembly_ids = list(map(lambda a: a.uuid, self.assemblies))
+        assembly_ids = list(map(lambda a: a._uuid, self._assemblies))
         if uuid_ in assembly_ids:
             return True
-        for assembly in self.assemblies:
+        for assembly in self._assemblies:
             if assembly.contains_uuid(uuid_):
                 return True
         return False
 
-    def to_dict(self) -> Dict:
+    def to_dict(self) -> dict:
         """
         Serializes the current LegoAssembly instance and its descendants into a dict.
 
@@ -391,20 +473,14 @@ class LegoAssembly:
             of its component and sub-assembly children.
         """
         dict_ = {
-            "uuid": self.uuid,
+            "uuid": self._uuid,
             "properties": self.properties,
-            "layer": self.layer,
+            "layer": self._layer,
         }
-        dict_["components"] = [component.to_dict() for component in self.components]
-        dict_["assemblies"] = [assembly.to_dict() for assembly in self.assemblies]
+        dict_["components"] = [component.to_dict() for component in self._components]
+        dict_["assemblies"] = [assembly.to_dict() for assembly in self._assemblies]
         return {"assembly": dict_}
 
-    def __repr__(self):
-        """
-        String representation of the object including the component label and UUID.
-        """
-        return f"LegoAssembly {self.properties['label']} [{self.uuid}]"
-
     def clone(self, label: Optional[str] = None) -> LegoAssembly:
         """
         Creates a deep clone of the current LegoAssembly instance, including
@@ -420,24 +496,81 @@ class LegoAssembly:
         """
         if label is None:
             label = self.properties["label"]
-        clone = LegoAssembly(self.layer, None, deepcopy(self.properties))
+        clone = LegoAssembly(self._layer, None, deepcopy(self.properties))
         clone.properties["label"] = label
-        for component in self.components:
+        for component in self._components:
             clone.add_component(component.clone())
-        for assembly in self.assemblies:
+        for assembly in self._assemblies:
             clone.add_assembly(assembly.clone())
         return clone
 
+    def __eq__(self, obj: object) -> bool:
+        """Check if provided object is equal to this assembly.
+
+        Args:
+            obj (object): Object to compare to.
+
+        Returns:
+            bool: True if UUID, properties, layer, components and assemblies match.
+                False otherwise.
+        """
+        # in case of mismatching class
+        if not isinstance(obj, LegoAssembly):
+            return False
+
+        if (
+            self._uuid == obj._uuid
+            and self.properties == obj.properties
+            and self._layer == obj._layer
+            and self._components == obj._components
+            and self._assemblies == obj._assemblies
+        ):
+            return True
+        else:
+            return False
+
+    def __repr__(self):
+        """Create a machine-readable representation of the instance.
+
+        Returns:
+            str: A string representing the LegoAssembly instance.
+        """
+
+        label_str = ""
+        if self.properties["label"] is not None:
+            label_str = f"label='{self.properties['label']}', "
+        layer_str = f"layer={self._layer}, "
+        property_str = ", ".join(
+            [
+                f"'{k}': '{v}'" if isinstance(v, str) else f"'{k}': {v}"
+                for k, v in self.properties.items()
+                if not k == "label"
+            ]
+        )
+        property_str = f"**{{{property_str}}}" if property_str else property_str
+
+        return f"LegoAssembly({label_str}{layer_str}{property_str})"
+
+    def __str__(self):
+        """Handle the conversion of LegoComponent objects to str objects.
+
+        Returns:
+            str: A string converted from the LegoComponent instance.
+        """
+        if self.properties["label"] is None:
+            return f"LegoAssembly [{self._uuid}]"
+        return f"LegoAssembly {self.properties['label']} [{self._uuid}]"
+
 
-def print_assembly_tree(root, levels=None):
+def print_assembly_tree(root: LegoAssembly, levels: list[bool] = None) -> None:
     """
     Prints the assembly tree starting from root with a visualization
     implemented with text characters.
 
     Args:
         root (LegoAssembly): The root of the assembly tree to print.
-        levels (List[bool]): Internally used by recursion to know where
-            to print vertical connection. Defaults to an empty list.
+        levels (list[bool]): Internally used by recursion to know where
+            to print vertical connection. Defaults to None.
     """
     if not isinstance(root, LegoAssembly):
         raise TypeError(
@@ -452,12 +585,12 @@ def print_assembly_tree(root, levels=None):
         assembly_padding = "├── " if levels[-1] else "└── "
     print(f"{connection_padding[:-4]}{assembly_padding}{root}")
     """ Recursively print child components. """
-    for i, assembly in enumerate(root.assemblies):
-        is_last = i == len(root.assemblies) - 1 and len(root.components) == 0
+    for i, assembly in enumerate(root._assemblies):
+        is_last = i == len(root._assemblies) - 1 and len(root._components) == 0
         print_assembly_tree(assembly, [*levels, not is_last])
     """ Print the components. """
-    for i, component in enumerate(root.components):
-        component_padding = "├── " if i < len(root.components) - 1 else "└── "
+    for i, component in enumerate(root._components):
+        component_padding = "├── " if i < len(root._components) - 1 else "└── "
         print(f"{connection_padding}{component_padding}{component}")
 
 
@@ -482,11 +615,11 @@ def correct_aggregation_hierarchy(root: LegoAssembly, strict: bool = False):
     higher_level = operator.le
     if strict:
         higher_level = operator.lt
-    for component in root.components:
-        if not higher_level(root.layer.value, component.layer.value):
+    for component in root._components:
+        if not higher_level(root._layer.value, component.layer.value):
             return False
-    for assembly in root.assemblies:
-        if not higher_level(root.layer.value, assembly.layer.value):
+    for assembly in root._assemblies:
+        if not higher_level(root._layer.value, assembly._layer.value):
             return False
         if not correct_aggregation_hierarchy(assembly, strict):
             return False
@@ -498,12 +631,12 @@ class KPIEncoder(json.JSONEncoder):
     JSON encoder that handles special class types for KPI serialization.
     """
 
-    def default(self, o):
+    def default(self, o: Any):
         """
         Overrides default method to handle special conversion cases.
 
         Args:
-            o : Object to be converted.
+            o (Any): Object to be converted.
 
         Returns:
             Converted object or super method if no applicable case is found.

minimalbeispiel.ipynb

 %% Cell type:markdown id:c9328cd1 tags:
 
-# FAIRe Qualitäts-KPI
+# FAIRe Qualitäts-KPIs
 
 %% Cell type:markdown id:2ee8746d tags:
 
 ## Einführung
-FAIR Quality KPIs schaffen eine transparente und nachvollziehbare Entscheidungsgrundlage. In dieser Lerneinheit sollen sie die Methodik erlernen, indem sie LEGO Autos zusammenbauen, deren Quality KPIs bestimmen und miteinander vergleichen.
+FAIRe Qualitäts-KPIs schaffen eine transparente und nachvollziehbare Entscheidungsgrundlage. In dieser Lerneinheit sollen sie die Methodik erlernen, indem sie LEGO-Autos zusammenbauen, deren Quality KPIs bestimmen und miteinander vergleichen.
 
 ### Werkzeug für den Zusammenbau
 Der Zusammenbau der Autos erfolgt virtuell. Als Werkzeug steht Ihnen das Modul `classes` zur Verfügung. In diesem sind unterschiedliche Klassen und Methoden implementiert (Objektorientierung). Sie erzeugen jeweils Objekte der Klassen. Ein Objekt ist dabei die virtuelle Abbildung eines realen Bauteiles. Die Eigenschaften des Bauteiles werden über die Eigenschaften des Objektes abgebildet.
 
 ### Berechnung der Quality KPIs
 KPIs (Key Performance Indikatoren) sind Kenngrößen des Systems. Sie werden über Berechnungsvorschriften bestimmt. Diese Berechnungsvorschriften sind von Ihnen als python-Funktionen im Modul `calculation_rules` zu implementieren.
 
 ### Datenblätter
 Für den Zusammenbau stehen Ihnen verschiedene Bauteile in unterschiedlichen Ausführungen zur Verfügung. Sie nutzen die Datenblätter, die als `json-Dateien` zur Verfügung gestellt werden, um Ihre Autos zusammenzubauen.
 
 %% Cell type:markdown id:1c702114 tags:
 
 ## Eigene Module und Minimalbeispiel
 Für die Ausarbeitung nutzen wir zwei eigene Module (Python-Dateien), die im Ordner `functions` gespeichert sind.
 Das Modul `calculation_rules` erweitern Sie während der Ausarbeitung. Um die Änderungen zu nutzen, müssen Sie das Notebook neu starten.
 Im Modul `classes` befinden sich die komplette Klassen und Funktionen zur Verwendung.
 
 Mit einem Minimalbeispiel wird Ihnen gezeigt, wie sie die Module nutzen.
 
 %% Cell type:markdown id:670118b3 tags:
 
 #### Versuchsaufbau:
-Die folgende Abbildung zeugt den Versuchsaufbau für das Tretrollerbeispiel in LeoCAD. Die transparenten Bauteile Sind dabei nicht Teil des hier erläuterten Zusammenbaus, können aber mit dem zur Verfügung gestellten Baukasten ergänzt werden:
-
-%% Cell type:markdown id:2f969ed9 tags:
-
-![Tretroller in LeoCAD](figures/leocad_screenshot_cut.png)
+Die folgende Abbildung zeigt den Versuchsaufbau des Minimalbeispiels in LeoCAD. Die transparenten Bauteile sind dabei nicht Teil des hier erläuterten Zusammenbaus, können aber mit dem zur Verfügung gestellten Baukasten ergänzt werden:
+![Minimalbeispiel aus LeoCAD](figures/leocad_screenshot_cut.png)
 
 %% Cell type:markdown id:6d3310be tags:
 
 ### Modul classes
 Enthält `LegoComponent, LegoAssembly, AggregationLayer, KPIEncoder` und die Funktion `print_assembly_tree`.
-`LegoComponent` bildet einzelne Komponenten ab, während `LegoAssembly` zusammengesetzte Aggregationsebenen abdeckt, also Bauteil, Baugruppe und System. Zur Unterscheidung dient die Klasse Aggregationlayer, diese ist für `LegoComponent` immer `Component` (Komponente), muss für `LegoAssembly`  entsprechend auf `SYSTEM`(System) , `ASSEMBLY`(Baugruppe) oder `SUBASSEMBLY`(Bauteil) gesetzt werden.
+`LegoComponent` bildet einzelne Komponenten ab, während `LegoAssembly` zusammengesetzte Aggregationsebenen abdeckt, also Bauteil, Baugruppe und System. Zur Unterscheidung dient die Klasse `AggregationLayer`, diese ist für `LegoComponent` immer `Component` (Komponente), muss für `LegoAssembly`  entsprechend auf `SYSTEM` (System) , `ASSEMBLY` (Baugruppe) oder `SUBASSEMBLY` (Bauteil) gesetzt werden.
 
 Wir bauen aus Achse, Rahmen und Reifen einen Tretroller zusammen.
 
 %% Cell type:code id:b2778dee tags:
 
 ``` python
 # import modules
 import json
 import pprint
 from functions import calculation_rules
 
 # Importing all modules one by one to provide an overview
 # The next commented line would provide the same result in one line
 # from functions.classes import *
 from functions.classes import LegoComponent
 from functions.classes import LegoAssembly
 from functions.classes import AggregationLayer
 from functions.classes import KPIEncoder
 from functions.classes import print_assembly_tree
 
 # When you are writing code yourself later, you might want to copy
 # these imports to avoid rerunning the full notebook after restart
 ```
 
 %% Cell type:code id:0b1f9aff tags:
 
 ``` python
 # Create the wheels and axles as single components first
 # Look up the specific item you want from the provided json files,
 # we can load the full file into a dict
 with open("datasheets/axles.json") as json_file:
     axles = json.load(json_file)
 # Pick a specific axle via its 'item number'
 print(axles["32073"])
 
 # Create the component with the dict:
 front_axle = LegoComponent("front axle", axles["32073"])
 # Both label and the data dict are optional parameters.
-# You can view, add or edit the properties just any dict:
+# You can view, add or edit properties:
 print(front_axle.properties["label"])
-front_axle.properties["color"] = "grey"
+front_axle.properties["color"] = "light bluish grey"
 
 
 # Create the second axle
 back_axle = LegoComponent()
 back_axle.properties["label"] = "back axle"
 back_axle.properties.update(axles["32073"])
 # Do not use = here, otherwise you'd overwrite existing properties.
 # Instead use update to have all entries added to properties
-back_axle.properties["color"] = "grey"
+back_axle.properties["color"] = "light bluish grey"
 # Viewing dicts in one line is not easy to read,
 # a better output comes with pretty print (pprint):
 pprint.pprint(back_axle.properties)
 ```
 
+%% Output
+
+    {'item number': 32073, 'item description': 'Axle 5 studs', 'category': 'axle', 'price [Euro]': 0.001, 'mass [g]': 0.66, 'environmental impact [kg CO2e /kg]': 11.03, 'delivery time [days]': 3, 'data source': 'https://www.bricklink.com/v2/catalog/catalogitem.page?P=32073', 'dimension [studs]': 5}
+    front axle
+    {'category': 'axle',
+     'color': 'grey',
+     'data source': 'https://www.bricklink.com/v2/catalog/catalogitem.page?P=32073',
+     'delivery time [days]': 3,
+     'dimension [studs]': 5,
+     'environmental impact [kg CO2e /kg]': 11.03,
+     'item description': 'Axle 5 studs',
+     'item number': 32073,
+     'label': 'back axle',
+     'mass [g]': 0.66,
+     'price [Euro]': 0.001}
+
 %% Cell type:code id:b4a8e8c8 tags:
 
 ``` python
 # Now wheels
-with open("datasheets/wheels.json") as json_file:
-    wheels = json.load(json_file)
+# A wheel consists of a rim (Felge) and a tire (Reifen)
+with open("datasheets/rims.json") as json_file:
+    rims = json.load(json_file)
+with open("datasheets/tires.json") as json_file:
+    tires = json.load(json_file)
 # Adding the color here already as dict, and the surface as key-value argument.
 # Multiple of both parameters are supported, but only in this order.
 # front_wheel = LegoComponent(
 # 'front wheel', wheels['2903c02'], {'color':'yellow'},winter='true')
 
-front_wheel = LegoComponent(
-    "front wheel", wheels["2903c02"], surface="rough", paint="glossy"
-)
-pprint.pprint(front_wheel.properties)
+front_rim = LegoComponent("front rim", rims["56904"], surface="rough", paint="glossy")
+front_tire = LegoComponent("front tire", tires["30699"], winter=True)
+pprint.pprint(front_rim.properties)
 
 # We included a clone function to both Lego classes, so you can easily
 # create duplicate objects. Passing the new label is optional
-back_wheel = front_wheel.clone("back wheel")
+back_rim = front_rim.clone("back rim")
+back_tire = front_tire.clone("back tire")
 ```
 
+%% Output
+
+    {'category': 'rim',
+     'data source': 'https://www.bricklink.com/v2/catalog/catalogitem.page?P=56904',
+     'delivery time [days]': 5,
+     'diameter [mm]': 30.0,
+     'environmental impact [kg CO2e /kg]': 32.06,
+     'item description': 'Wheel 30mm D. x 14mm',
+     'item number': 56904,
+     'label': 'front rim',
+     'mass [g]': 4.1,
+     'paint': 'glossy',
+     'price [Euro]': 0.01,
+     'related items': 30699,
+     'surface': 'rough'}
+
 %% Cell type:code id:25bd06c5 tags:
 
 ``` python
 # Create subassemblies and add the wheels and axles
 
 # The AggregationLayer must be used, passing the label
 # or additional properties is optional
 front_wheel_assembly = LegoAssembly(
     AggregationLayer.SUBASSEMBLY,
     "front wheel assembly",
     assembly_method="stick together like lego blocks",
 )
 # Add LegoComponents to the LegoAssembly, single or as list
-front_wheel_assembly.add([front_wheel, front_axle])
+front_wheel_assembly.add([front_rim, front_tire])
 # You can access the components of an assembly like this:
 print(front_wheel_assembly.components[1].properties["label"])
 
 # Assemblies can be cloned as well (including their children),
 # but don't forget to adjust labels or you might be stuck with
 # a 'front wheel' in your 'back wheel assembly'
 
 # Stick together back wheel parts
 back_wheel_assembly = LegoAssembly(
     AggregationLayer.SUBASSEMBLY, "back wheel assembly"
     )
-back_wheel_assembly.add([back_wheel, back_axle])
+back_wheel_assembly.add([back_rim, back_tire])
+
+# Now combine wheels and axles
+
+front_axle_assembly = LegoAssembly(
+    AggregationLayer.ASSEMBLY, "front axle assembly"
+)
+front_axle_assembly.add([front_wheel_assembly, front_axle])
+
+back_axle_assembly = LegoAssembly(
+    AggregationLayer.ASSEMBLY, "back axle assembly"
+)
+back_axle_assembly.add([back_wheel_assembly, back_axle])
 ```
 
+%% Output
+
+    front tire
+
+    ---------------------------------------------------------------------------
+    KeyboardInterrupt                         Traceback (most recent call last)
+Cell     In[6], line 35
+         30 front_axle_assembly.add([front_wheel_assembly, front_axle])
+         32 back_axle_assembly = LegoAssembly(
+         33     AggregationLayer.ASSEMBLY, "back axle assembly"
+         34 )
+    ---> 35 back_axle_assembly.add([back_axle_assembly, back_axle])
+File     c:\Users\Lamm\Documents\02_Areas\Praktikum_Digitalisierung\01_quality-kpi_dev\functions\classes.py:374, in LegoAssembly.add(self, part)
+        372 elif isinstance(part, list):
+        373     for p in part:
+    --> 374         self.add(p)
+        375 else:
+        376     raise TypeError(
+        377         f"Argument should be of types {LegoAssembly.__name__}, "
+        378         f"{LegoComponent.__name__} or a list of them. "
+        379         f"Got {type(part).__name__} instead."
+        380     )
+File     c:\Users\Lamm\Documents\02_Areas\Praktikum_Digitalisierung\01_quality-kpi_dev\functions\classes.py:369, in LegoAssembly.add(self, part)
+        356 """
+        357 Adds either a Lego component, a subassembly or a (mixed) list of them to the
+        358 current assembly. Uses internal functions add_component() and add_assembly().
+       (...)
+        366         instance, or a (mixed) list of them.
+        367 """
+        368 if isinstance(part, LegoComponent):
+    --> 369     self.add_component(part)
+        370 elif isinstance(part, LegoAssembly):
+        371     self.add_assembly(part)
+File     c:\Users\Lamm\Documents\02_Areas\Praktikum_Digitalisierung\01_quality-kpi_dev\functions\classes.py:310, in LegoAssembly.add_component(self, component)
+        304 if not isinstance(component, LegoComponent):
+        305     raise TypeError(
+        306         f"Argument should be of type {LegoComponent.__name__}, "
+        307         f"got {type(component).__name__} instead."
+        308     )
+    --> 310 if self.get_root_assembly().contains_uuid(component._uuid):
+        311     raise AssertionError(
+        312         f"This assembly or a subassembly already contains "
+        313         f"the component with ID "
+        314         f"{component._uuid}."
+        315     )
+        316 component._parent = self
+File     c:\Users\Lamm\Documents\02_Areas\Praktikum_Digitalisierung\01_quality-kpi_dev\functions\classes.py:439, in LegoAssembly.get_root_assembly(self)
+        431 """
+        432 Returns the root LegoAssembly of the current assembly by recursively
+        433 searching up the tree until the top-most parent (the root) is found.
+       (...)
+        436     The root LegoAssembly of the current LegoAssembly instance.
+        437 """
+        438 current_assembly = self
+    --> 439 while current_assembly._parent is not None:
+        440     current_assembly = current_assembly._parent
+        441 return current_assembly
+    KeyboardInterrupt:
+
 %% Cell type:code id:2b6648e1 tags:
 
 ``` python
 # Create frame component and assemble the system
 
 with open("datasheets/frame.json") as json_file:
     frame = json.load(json_file)
 scooter_frame = LegoComponent("scooter frame", frame["3703"], {"color": "red"})
 
 # The scooter is our system level assembly, you can choose the AggregationLayer
 # But the hiercarchy (SYSTEM > ASSEMBLY > SUBASSEMBLY) must be in order.
 # Components can be added to all LegoAssembly objects
 
 scooter = LegoAssembly(
     AggregationLayer.SYSTEM,
     "scooter",
     manufacturer="FST",
     comment="Faster! Harder! Scooter!",
 )
 # add frame and subassemblies
 scooter.add([scooter_frame, front_wheel_assembly, back_wheel_assembly])
 ```
 
 %% Cell type:code id:71324895 tags:
 
 ``` python
 # Look at the assembly
 
 # We can get all LegoComponents from this assembly.
-# Without parameter 'max_depth' only direct children will be listed.
-scooter.get_component_list(5)
+# If parameter 'max_depth' is set to 0, only direct children will be listed:
+print(scooter.get_component_list(max_depth=0))
+# If it is set to -1 (default), all LegoComponents are listed:
+print(scooter.get_component_list())
 ```
 
+%% Output
+
+    [LegoComponent scooter frame [a90b291e-696c-41c7-b9b8-43d34724b460]]
+    [LegoComponent scooter frame [a90b291e-696c-41c7-b9b8-43d34724b460], LegoComponent front wheel [b03ce5b5-9c6c-4315-a67b-902c729c3d7b], LegoComponent front axle [64771daf-733a-4a2a-8520-9fa94259e50e], LegoComponent back wheel [8fcb7db9-6fec-4e70-b274-0c4fe403550b], LegoComponent back axle [2ce57b96-64b8-48b1-aac8-b0731adaa93b]]
+
 %% Cell type:markdown id:001f1c77 tags:
 
 ### Modul calculation_rules
 
-Um für unser System "Tretroller" ein KPI  für das Gesamtgewicht zu erzeugen, wurde in `functions.calculation_rules` die Funktion `kpi_sum` definiert. Zusammen mit den Hilfsfunktionen der Klasse können wir nun das KPI Gewicht für das System hinzufügen. Die Massen der einzelnen Komponenten sind in den Datenblättern unter `mass [g]` enthalten.
+Um für unser System "Tretroller" einen KPI zu erzeugen, wird die Masse des Systems betrachtet. Die Masse der einzelnen Komponenten ist in den Datenblättern unter `mass [g]` enthalten.
 
 %% Cell type:code id:7b60d0fb tags:
 
 ``` python
 # test the import
 calculation_rules.test_function()
 ```
 
+%% Output
+
+    You called the test function.
+
 %% Cell type:code id:fe4edad6 tags:
 
 ``` python
-# Add mass to assemblies
+total_mass = calculation_rules.kpi_mass(scooter)
 
-# List all components' mass
-combined_weight = 0
-for c in scooter.get_component_list(-1):
-    combined_weight += c.properties["mass [g]"]
-print("Gesamtgewicht: ", combined_weight, "g")
+print("Gesamtmasse: ", total_mass, "g")
 # Add KPI to system
-scooter.properties["mass [g]"] = combined_weight
+scooter.properties["mass [g]"] = total_mass
 
 # We can also add the mass to the subassemblies.
 # children() returns a dict with a list of added
 # components and assemblies.
 for a in scooter.children()["assemblies"]:
     a_mass = 0
     for c in a.get_component_list(-1):
         a_mass += c.properties["mass [g]"]
     a.properties["mass [g]"] = a_mass
 ```
 
+%% Output
+
+    Gesamtmasse:  67.19 g
+
 %% Cell type:code id:c26b36c8 tags:
 
 ``` python
 scooter.get_component_list(-1)
 ```
 
+%% Output
+
+    [LegoComponent scooter frame [a90b291e-696c-41c7-b9b8-43d34724b460],
+     LegoComponent front wheel [b03ce5b5-9c6c-4315-a67b-902c729c3d7b],
+     LegoComponent front axle [64771daf-733a-4a2a-8520-9fa94259e50e],
+     LegoComponent back wheel [8fcb7db9-6fec-4e70-b274-0c4fe403550b],
+     LegoComponent back axle [2ce57b96-64b8-48b1-aac8-b0731adaa93b]]
+
 %% Cell type:code id:4d56419f tags:
 
 ``` python
 # Look at the full assembly with KPI
 
 # Print the full assembly with all levels
 print_assembly_tree(scooter)
 ```
 
+%% Output
+
+    LegoAssembly scooter [86fdda66-adb2-48c0-b6f8-f6c59d488662]
+    ├── LegoAssembly front wheel assembly [e02a87d2-cb0b-4695-b237-9ca17f9611da]
+    │   ├── LegoComponent front wheel [b03ce5b5-9c6c-4315-a67b-902c729c3d7b]
+    │   └── LegoComponent front axle [64771daf-733a-4a2a-8520-9fa94259e50e]
+    ├── LegoAssembly back wheel assembly [db5db4c5-36c3-4b90-88eb-299c46a30049]
+    │   ├── LegoComponent back wheel [8fcb7db9-6fec-4e70-b274-0c4fe403550b]
+    │   └── LegoComponent back axle [2ce57b96-64b8-48b1-aac8-b0731adaa93b]
+    └── LegoComponent scooter frame [a90b291e-696c-41c7-b9b8-43d34724b460]
+
 %% Cell type:code id:b31416d3 tags:
 
 ``` python
 # Dump to json file with to_dict() and KPIEncoder
 with open("scooter.json", "w") as fp:
-    json.dump(scooter.to_dict(), fp, cls=KPIEncoder)
+    json.dump(scooter.to_dict(), fp, cls=KPIEncoder, indent=4)
 # full view is too big for Juypter (try it)
 # pprint.pprint(scooter.to_dict())
 ```
 
 %% Cell type:markdown id:53793ae8 tags:
 
 In dieser exportierten json-Datei ('scooter.json') sind die Werte maschinen- und menschenlesbar hinterlegt.
 Zusammen mit der Berechnungsvorschrift in `calculation_rules` ist auch die Entstehung des KPI nachvollziehbar und wiederverwendbar dokumentiert und damit 'FAIR'.
 
 %% Cell type:markdown id:92c77051 tags:
 
 #### Zusätzliche Details
 
 %% Cell type:code id:b91fed73 tags:
 
 ``` python
 # Each child knows its parent
 first_child = scooter.children()["assemblies"][0]
 print("Child:", first_child)
 print("Parent:", first_child.parent)
 # Also we can access the "top" parent
 latest_child = first_child.children()["components"][0]
 print("Top parent: ", latest_child.get_root_assembly())
 
 # Each part created has a unique identifier (the long number in [])
-# Don't try add the identical part again.
+# Don't try to add the identical part again.
 ```
+
+%% Output
+
+    Child: LegoAssembly front wheel assembly [e02a87d2-cb0b-4695-b237-9ca17f9611da]
+    Parent: LegoAssembly scooter [86fdda66-adb2-48c0-b6f8-f6c59d488662]
+    Top parent:  LegoAssembly scooter [86fdda66-adb2-48c0-b6f8-f6c59d488662]