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| <td class="pageTitle">Concept: XP Practices</td> |
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| <div class="sectionHeading">Main Description</div> |
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| XP is a collection of guiding values and best practices. Most of these practices have been used in the industry in some |
| shape or form for a number of years. XP has simply identified them and tried to push the envelope of these practices in |
| order to get the most benefit from them. Taken individually, these practices are all fairly simple. But it is the sum |
| of all of them that provides the most benefit as they reinforce each other to address the most difficult problems teams |
| encounter when developing software. |
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| This diagram arranges the core practices of Extreme Programming in a way that makes them easy to remember and that |
| exemplifies the steering and control cycles of the process. |
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| <p> |
| The outer red circle is called the "Circle of Life". It's what keeps an XP project going, producing tested working |
| software. The <a class="elementLink" href="./../../../xp/guidances/concepts/whole_team,7.89591827591278E-306.html" guid="7.89591827591278E-306">Whole Team</a>, customer members and development members, work together--preferably |
| physically together--to build the project. Using the <a class="elementLinkWithUserText" href="./../../../xp/guidances/concepts/planning_game,2.7371805612676613E-305.html" guid="2.7371805612676613E-305">Planning Game</a> elements of Release Planning and Iteration Planning, they plan a |
| series of <a class="elementLinkWithUserText" href="./../../../xp/guidances/concepts/small_releases,5.762953011420275E-306.html" guid="5.762953011420275E-306">Small |
| Releases</a> of software that demonstrably pass all the <a class="elementLinkWithUserText" href="./../../../xp/guidances/concepts/customer_tests,2.297945473205673E-305.html" guid="2.297945473205673E-305">Customer Tests</a>. |
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| The innermost blue circle describes the day to day, moment to moment, work of the XP developers. Each feature is |
| addressed with <a class="elementLinkWithUserText" href="./../../../xp/guidances/concepts/simple_design,1.6109092258980447E-306.html" guid="1.6109092258980447E-306">Simple Design</a>, ensuring that the design of the system is just right for the features |
| supported. The programmers work in <a class="elementLinkWithUserText" href="./../../../xp/guidances/concepts/pair_programming,3.876855509996079E-307.html" guid="3.876855509996079E-307">pairs</a> for all production code development, providing continuous code review and |
| valuable, team-wide understanding of the system. They build the software using <a class="elementLinkWithUserText" href="./../../../xp/guidances/concepts/test_driven_development,1.620567348185129E-306.html" guid="1.620567348185129E-306">Test-Driven Development,</a> a technique that produces well-crafted and well-tested |
| software with a minimum of wasted effort, and the design is kept clean by the continuous improvement process of <a class="elementLinkWithUserText" href="./../../../xp/guidances/concepts/refactoring_xp_programming,1.4410217108363206E-306.html" guid="1.4410217108363206E-306">Refactoring</a>. |
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| The middle green circle contains the important supporting practices of XP. The software is designed according to a |
| common, shared, evolving <a class="elementLinkWithUserText" href="./../../../xp/guidances/concepts/metaphor_system_of_names,4.884861766532753E-306.html" guid="4.884861766532753E-306">Metaphor</a> that helps it all hang together. It is kept <a class="elementLinkWithUserText" href="./../../../xp/guidances/concepts/continuous_integration,3.193414568279561E-305.html" guid="3.193414568279561E-305">continuously integrated</a> with many system builds every day, each one fully tested. The |
| team shares ownership of of all the code so that needed changes can be made by any qualified pair, not just by one |
| individual. Since everyone works on everything, the team evolves a <a class="elementLinkWithUserText" href="./../../../xp/guidances/concepts/coding_standard,8.8116853923311E-307.html" guid="8.8116853923311E-307">standard |
| way of coding</a>. Finally, XP teams work at a <a class="elementLinkWithUserText" href="./../../../xp/guidances/concepts/xp_sustainable_pace,3.133529870649493E-306.html" guid="3.133529870649493E-306">sustainable pace</a> that enables them to deliver tested software on a predictable basis |
| from the first day of the project until the last. |
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