Crystal is my considered effort to construct a package of conventions that raises the odds of succeeding in the project and actually being used. The big shift since the first edition is the completion of Crystal Clear, the version for small, collocated teams. Because Crystal Clear is described at length in its own book (Cockburn 2005a), what belongs here are the insights I gained into Crystal and agile methodologies in general while writing that book. Those include Crystal's genetic code, installing Crystal Clear, stretching Crystal Clear to Yellow, and new techniques. The Crystal Methodologies: Evolution
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