GoF Format Cont’d

• Applicability

  • What are the situations in which the pattern can be applied? How can you recognize these situations?

• Structure

• Participants

  • The classes and/or objects participating in the design pattern and their responsibilities.

• Collaborations

  • How the participants collaborate to carry out their responsibilities.

• Consequences

  • How does the pattern support its objectives? What are the trade-offs and results of using the pattern? What aspect of system structure does it let you vary independently?

• Implementation

  • What pitfalls, hints, or techniques should you be aware of when implementing the pattern? Are there language-specific issues?

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