Team Collaboration
XP takes the notion of an incremental and iterative life cycle to the extreme, as shown in Figure 14-6. The individual aspects of beauty described previously are brought together to form a powerful, sustainable synergy.

Figure 14-6. XP Incremental and iterative life cycle
The vertical lines extending from Plan to Deploy mark three separate iterations. An iteration starts with lightweight planning to identify the stories on which to focus during the next time box. It finishes with running, tested stories that can be deployed to a Qual environment for further testing.
The shorter vertical lines extending from Analyze to Test indicate multiple stories within an iteration. An individual story goes through its own software development life cycle: analyze, design, develop, and test. All the while, it is continuously integrated with the rest of the evolving system.
The callout notes highlight opportunities for proactive and continuous quality, encompassing all process steps and multiple team roles in close collaboration:
- Analyze
Writing and automating Examples requires collaboration between a multitude of roles, each providing a different perspective and skill: subject matter expert, business analyst, tester, toolsmith, technical writer, and user experience designer.
- Design
Developers and testers collaborate closely during unit test-driven development. The testable design makes ...
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