an Agile Software Development methodology
from the book draft - One particular triplet showed up repeatedly: colocation of the team, frequent delivery, and access to an expert user. The differences in results between projects that did and didn't do these far exceeded any other short list of practices. This book builds from that triplet.
The difference between Crystal Clear and Extreme Programming is that XP is much more disciplined, Crystal Clear is much more tolerant, even sloppy-looking. I would say XP is more productive, Crystal Clear more likely to get followed.
Got its own book published in 2004. ISBN:0201699478