Object Oriented Design

CRC Cards

In the CRC card method, you create an index card for each class.
CRC stands for "classes", "responsibilities", "collaborators."
As you think about the verbs in the task description, pick the card of the class that you think should be responsible, and write that responsibility on the left-hand side of the card.
For each responsibility, you record on the right-hand side of the card which other classes (the collaborators) are needed to fulfill it.