Extreme Programming Maturity Model

Level -2: You couldn't care because you've never heard of it.
Level -1: You are considering XP and beginning to care about your level of attainment.
Level 0: You work according to the practices in ExtremeProgrammingExplained.
Level 1: You have evolved away from those practices based on your experience.
Level 2: You no longer care what level you have achieved.