CRC Modeling

 

CRC = Class Responsibility Collaborator

CRC Modeling =

analyze own needs with:

• brainstorming (collect), process, organize, review, build CRC Model
• Subject Matter Expert/ Domain Experts
  
  
  
  

  Assigning Collaborations

  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.