&gt; On somewhat aside, While it&#x27;s true that most &quot;Traditional Project Management&quot; implies waterfall, it&#x27;s not quite true that &quot;Water can&#x27;t flow up the waterwall&quot;. At least for the last few editions, PMBOOK explicitly indicated that planning, execution, and monitoring are iterative and feed into each other.<p>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.)<p>[0] <a href="http:&#x2F;&#x2F;www.cs.umd.edu&#x2F;class&#x2F;spring2003&#x2F;cmsc838p&#x2F;Process&#x2F;waterfall.pdf" rel="nofollow">http:&#x2F;&#x2F;www.cs.umd.edu&#x2F;class&#x2F;spring2003&#x2F;cmsc838p&#x2F;Process&#x2F;wate...</a>