This gives a good historical overview: http://www.bawiki.com/wiki/Waterfall.html http://www.bawiki.com/wiki/Waterfall.html Wikipedia gives a shorter version:

This gives a good historical overview: http://www.bawiki.com/wiki/Waterfall.html http://www.bawiki.com/wiki/Waterfall.html Wikipedia gives a shorter version: In fact Royce, known for his 1970 paper from which the Waterfall model for software development was mistakenly drawn, demonstrated that while the development of large software systems required a more thorough approach, there was inherent risk in a single-pass sequential approach. He proposed an iterative approach and advocated that projects should pass through this at least twice.