XP’s philosophy on Practices is very non-prescriptive, and advises an explorative approach, based on the XP Principles and XP Values.

Practices as presented in “eXtreme Programming Explained, 2nd Edition” by Kent Beck, the second of the Three Extremos

Primary Practices
Corollary Practices
  • Real Customer Involvement
  • Incremental Deployment
  • Team Continuity
  • Shrinking Teams
  • Root Cause Analysis
  • Shared Code
  • Code And Tests
  • Single Code Base
  • Daily Deployment
  • Negotiated Scope Contract
  • Pay Per Use

(Source: c2 wiki)

Ron Jeffries is the third of the Three Extremos