CRC = Class Responsibility Collaborator
CRC Modeling =
analyze own needs with:
- brainstorming (collect), process, organize, review, build CRC Model
- Subject Matter Expert/ Domain Experts
Identify relationships among classes
- Each class is specialist in some set of knowledge and behaviors
- Classes must cooperate to accomplish nontrivial tasks
- Thus collaborations between classes are important
Pair collaborations with responsibilities on CRC card Use scenario-based role-play to find and/or test these collaborations
- Scenario is a system behavior and sequence of system events to realize it
- Simulating execution enables team to discover responsibilities and collaborations and/or check correctness of those already found
Add collaborations when relationships found
- Identify clients and servers
Server -- class that provides a resource
Client -- class that uses a resource
Server is collaborator of client, not vice versa
ATM example: In a withdrawal operation, Account is a client of the Withdrawal class
- Identify hierarchies of classes
ATM example: Transaction as superclass of Withdrawal, Deposit, etc.
