Class-Responsibility-Collaboration card
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Class Responsibility Collaborator (CRC cards) are a brainstorming tool used in the design of object-oriented software. They were proposed by Ward Cunningham and Kent Beck. [1] They are typically used when first determining which classes are needed and how they will interact.
CRC cards are usually created from index cards on which are written:
- The class name
- Its Super and Sub classes (if applicable)
- The responsibilities of the class.
- The names of other classes with which the class will collaborate to fulfill its responsibilities.
- Author
Using a small card keeps the complexity of the design at a minimum. It focuses the designer on the essentials of the class and prevents him from getting into its details and inner workings at a time when such detail is probably counter-productive. It also forces the designer to refrain from giving the class too many responsibilities. Because the cards are portable, they can easily be laid out on a table and re-arranged while discussing a design with other people.
A common method to determine what cards should be created is to read a specification for the program being designed and consider if each noun should be a class and if each verb should be a responsibility of the noun or class to which it belongs. Naturally, the existence of a noun or verb does not require a class or responsibility in the program, but it is considered a good starting point.
[edit] References
- ^ Beck, Kent; Cunningham, Ward (October 1989), "A laboratory for teaching object oriented thinking", ACM SIGPLAN Notices (New York, NY, USA: ACM) 24 (10): 1-6, ISBN 0-89791-333-7
[edit] See also
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