Preston Smith has written a pragmatic overview from of why Agile works. I particularly liked the reference to Donald Reinertsen?s research that showed:
* Out of hundreds of projects, there is no case in which requirements remained stable throughout design.
* Of more than 200 product developers, fewer than 5% had complete requirements before beginning design.
* On average, design commenced with only 58% of requirements specified.
If requirements are going to change, wouldn't we be better off acknowledging this and building our processes to accommodate it.
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