CRC cards are used to identify classes, responsibilities and collaborations between the objects in an object-oriented system. Several books have been published that demonstrate the CRC card technique: QuickCRC makes it easy to create CRC cards, define design scenarios and simulate your design on Macintosh or Windows. The CRC card approach can be summarized as follows: Create a card for each class Assign responsibilities and attributes to each card Identify collaborations between cards Simulate design scenarios between sets of cards Return to Design Methods