Dave Thomas says, "If you go in assuming that you can produce bug-free software, that attitude changes how you write the software. You tend to get arrogant, or at least complacent, about the actual code that you write."
Read this Artima.com interview with Dave Thomas and Andy Hunt:
Andy Hunt: What features are most important is not always clear up front. It's not even always clear to users. You need to be prepared to rock and roll and be flexible a bit. There's a kind of Heisenberg effect as you put a system into production and real users start using it. The act of introducing the system changes how the users work. It's almost impossible up front to be sure you know what the user wants, and then implement that perfectly. The very act of introducing your software into the user's world changes the game.
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