I was stunned by a statement by KentBeck at the XpTwoThousandAndOne that he doesn't see XP as a process.
Now I ask myself: "what is it then, after all?"
For me, my understanding changed over time. I was first focussed on the practices. Later on the practices became only means to set the values in place. The longer I do XP, the more I like to see it as an attitude. --DierkKoenig
To compare with ShuHaRi, XP is a process on the Shu level, but maybe more of an attitude on the Ri level...
See also: IsXpaMethod