Applying a waterfall approach in the context of unique change is a thinking error. It is miscategorizing emergent work (unknowable) as deterministic (knowable). It is taking an approach that came about in the context of manual labor shoveling iron ore or building dam number 57,001 (tasks that have been done sufficient times before to be knowable) and applying it to unique product development (which has never been done before and is unknowable).
