Communicate

Success is directly proportional to communication. Talk with people about XP in
your environment. There is no better way to learn. In Planning Extreme
Programming, Beck and Fowler say that XP always changes within each
environment in which it's applied. Without communication, these changes are
impossible.
Most problems with projects can be traced back to at least one communication
problem somewhere. Fortunately for geeks, you can't really do XP without
communicating.
XP forces all parties to communicate by employing practices that can't be done
without it, such as pair programming. If you don't at least communicate with your
pair, you'll have to be mute all