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> On somewhat aside, While it's true that most "Traditional Project Management" implies waterfall, it's not quite true that "Water can't flow up the waterwall". At least for the last few editions, PMBOOK explicitly indicated that planning, execution, and monitoring are iterative and feed into each other.

What is apparently generally regarded as the first published description of the waterfall method, from 1970 [0] (and which is, like most descriptions, critical of it) observed that in practice all the steps were iterative (and that the feedback was in many cases non-local.)

[0] http://www.cs.umd.edu/class/spring2003/cmsc838p/Process/wate...

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