Objects Relationship Model

Introduction to Objects Relationship Model

The CRC modelling first establishes  the first  elements  of class and object relationships. During this  establishment the  responsibility of each class is understood. So  the next  step is to define those collaborator classes that aid  in achieving  each responsibility. This establishes the connection between classes. A relationship  exists between any two classes that are connected. Most  common  relationship is the binary relationship.

Rumbaugh  and his  colleagues have  suggested that relationships can be derived by examining the  verbs or verb phrases in the statement of scope  or use cases for  the system. 

The  objects relationship model can be derived in  three steps:

1. Using the CRC index, cards a network of collaborator objects can be  drawn.

2. Reviewing  the CRC model index card responsibilities  and collaborators are evaluated and each unlabeled connection lines in named.

Once  the named  relationship have been  established, each  end in evaluated to determine carefully.

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