A piece of code thrown quickly up there as a starting point. Term comes from this interview with Ward Cunningham.

I was saying, "Once we get something on the screen, we can look at it. If it needs to be more we can make it more. Our problem is we've got nothing." 
See http://www.artima.com/intv/simplest3.html

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DoTheSimplestThingThatCouldPossiblyWork SimplestThingThatCouldPossiblyWork