Model Aggregation Composition Associations - Exercise Result
Each car can be configured with different engine and transmission combinations. The configuration is composed of (aggregation) an engine and a transmission. Each driver tests each car configuration. The association class ConfigurationAssessment contains the details of the drivers' evaluations. The engine is composed of the carburetor, pistons, and plugs (along with other unnamed parts).
However, these parts become permanent parts of the engine once installed, so we use composition instead of aggregation.