The problem of Waterfall didn’t arise in the initial paper. It arose in subsequent interpretations. Particularly, see Parnas’ classic paper arguing that we shou

The problem of Waterfall didn’t arise in the initial paper. It arose in subsequent interpretations. Particularly, see Parnas’ classic paper arguing that we should pretend to follow the “right” practices [which he defined as essentially Waterfall] even if we didn’t. I call this Parnism. It’s Parnism we should fight, not Waterfall as such.