Agile Landscape - Entry: CRC Cards

• eXtreme Programming

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CRC Cards in the context of eXtreme Programming

CRC Cards in eXtreme Programming

CRC (Class Responsibilities Collaborators) Cards are a collaborative design technique used in eXtreme Programming (XP) to facilitate communication and understanding of classes in object-oriented software development.

Purpose of CRC Cards:

1. Communication: CRC cards help team members communicate and discuss the responsibilities and collaborations of classes in a visual and interactive manner.

2. Understanding: They provide a clear and concise representation of classes, their responsibilities, and how they interact with other classes in the system.

Components of a CRC Card:

• Class Name: The name of the class being described.
• Responsibilities: The tasks or functions the class is responsible for.
• Collaborators: Other classes that the described class interacts with or relies on.

Usage of CRC Cards:

1. Brainstorming: Teams use CRC cards in brainstorming sessions to explore potential classes and their responsibilities.

2. Design: They help in the collaborative design of classes and their interactions before implementation.

3. Evolution: As the system evolves, CRC cards can be updated and revised to reflect changes in the design.

Benefits of CRC Cards:

• Visualization: They provide a visual representation of the design, making it easier to understand and communicate.
• Collaboration: Facilitate collaboration among team members by encouraging discussion and sharing of ideas.
• Flexibility: Easy to update and modify as the design evolves.

Resources:

1. Agile Modeling - CRC Cards
2. Martin Fowler’s CRC Card Description
3. XP Practices - CRC Card Overview

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