Roles Represent Patterns

In building process models based on objects, we identify a gap between object capabilities and the process world. To overcome this problem, a level of abstraction , role, above the object level, similar to pattern structure, has been deened. We have represented roles in diierent levels of abstraction containing CRC cards, for-malised CRC (CRC plus path expressions), Petri nets, and encapsulated structures to provide a pattern representation of roles. Since it is important to understand a pattern before reusing it, a representation method to encapsulate a solution for a pattern based on roles which rely on cooperative objects is suggested. An approach to reene the representations also helps to specify the exact semantics of such representations.