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Interesting to note that ExtremeProgramming has emerged as a methodology for programming; it appears to be based in trial and error programming! Without tests and refactoring, it is not workable at all. So why not design first, write tests to that design, then program, test, perform refactoring and iterate? That's exactly what ExtremeProgramming is, friend. Just do it in tiny increments. "The differences between XP and trial-and-error are basically two-fold: first, you solve each error as it comes up, so that it doesn't compound with later errors. And second, you meant to do it that way in the first place, rather than being forced to come back and deal with unforeseen complications.