Comment by exe34

> Unfortunately, a lot of unforeseen problems show up during the implementation phase, and people blame the waterfall model for not being flexible (agile) enough to address these.

my experience is that people spend half the time bikeshedding the obvious problems that waterfall would have identified in much less time, and then still hit the unforeseeable problems after implementation anyway. if they could have been foreseen, they would have been rolled into waterfall.