9. Kinds of Relationships between Classes

•     Cause/effect... because of...
  
      Temporal....... before, after , at the exact time...
  
      Association.... XYZ knows...
  
      Abstraction.... imposed by attributes and their values.
  
      Aggregation.... XYZ is part of ... ; ... consists of ...
  
      Composition.... XYZ is part of ... ; ... consists of ...
  
      Inheritance.... XYZ is kind of ... ; ... is a ...