XP

Principle

• simplicity

• communication

• feedbck

• courage

Core Practices

• Whole Team

• Planning Game

• Small Releases

• Customer Tests

• Simple Design

• Pair Programming

• Test-Driven Development

• Design Improvement

• Continuous Integration

• Collective Code Ownership

• Coding Standard

• Metaphor

• Sustainable Pace

Planning

• User stories are written

• Release planning creates the schedule

• Make frequent small releases

• The Project Velocity is measured

• The project is divided into iterations

• Iteration planning starts each iteration

• Move people around

• A stand-up meeting starts each day

• Fix XP when it breaks

Designing

• Simplicity

• Choose a system metaphor

• Use CRC cards for design sessions 在设计会议上使用CRC卡

• Create spike solutions to reduce risk 创建穿刺方案以降低风险

• No functionality is added early 没有过早加入现在还不需要的功能

• Refactor whenever and wherever possible 只要有可能就要重构

Coding

• The customer is always available

• Code must be written to agreed standards

• Code the unit test first

• All code is pair programmed

• Only one pair integrates code at a time

• Integrate often.

• Use collective code ownership

• Leave optimization till last

• No overtime

Testing

• All code must have unit tests.

• All code must pass all unit tests before it can be released.

• When a bug is found tests are created

• Acceptance tests are run often and the score is published