At the end, it is time to roll it all back up again: What is the core of Crystal Clear, and what puts the team farther into the safety zone? This chapter is very short.
Crystal Clear is a highly optimized way to use a small, co-located team, prioritizing for efficiency, habitability, and safety in delivering a satisfactory outcome. The brief description of Crystal Clear for level-3 practitioners is just this:
The lead designer and two to seven other developers
in a large room or adjacent rooms,
using information radiators such as whiteboards and flip charts,
having easy access to expert users,
distractions kept away,
deliver running, tested, usable code to the users
every month or two (quarterly at worst), ...