Mark Twain once noted, "The time to begin writing an article is when you have finished it to your satisfaction. By that time, you begin to clearly and logically perceive what it is that you really want to say." Twain's observation is right on the mark (no pun intended), and his wisdom applies just as well to software. Invariably, the subtleties, nuances, and scope of the problem at hand become clear only after the application has been written. Between typing the first line of code and packaging a release, there are any number of false starts, dead ends, rewrites, refactorings, qua