Class Responsibility Collaborator (CRC) Cards: An Agile IntroClass Responsibility Collaborator (CRC) Cards: An Agile Introduction A Class Responsibility Collaborator (CRC) model is a collection of standard index cards that have been divided into three sections, as depicted in Figure 1. A class represents a collection of similar objects, a responsibility is something that a class knows or does, and a collaborator is another class that a class interacts with
