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Class diagrams are the backbone of almost every object-oriented method including UML. They describe the static structure of a system. Basic Class Diagram Symbols and Notations Classes represent an abstraction of entities with common characteristics. Associations represent the relationships between classes.
Source: comp.object Date: 10-Jun-98 Romanian translation Related Sites Problem : UML has several relations (association, aggregation and composition) that seem to all mean the same thing : "has a". So, what is the difference between them?