CRC Card Prototyping

Tags

soft-eng

Is a low-tech [see page 5, strategy] to prototype useful object concepts.

The general [see page 6, technique] is:

• Use 15cm x 10cm file index cards (this sizes forces decomposition).
• Write the name of each candidate class on a card.
• Write down 2-7 responsibilities of this class.
• If the card has no responsibilities, delete it.
• If it has too many responsibilities [see page 8, split] them into two new sub-cards.
• Identify and write down any other classes that the card collaborates with.
• On the other side of the card write the:
  • Category (model, role, class, view, control, etc.)
  • Attributes (state, instance variables)
  • Constraints (any business rules for the attributes)