When I studied the SDLC formally, many years ago, “iterative waterfall” was called the spiral model. Waterfall is not iterative. That’s the whole point. You go

When I studied the SDLC formally, many years ago, “iterative waterfall” was called the spiral model. Waterfall is not iterative. That’s the whole point. You go over the waterfall once. If you’re iterating then, by definition, it’s not waterfall. > you can certainly also complete a user analysis that produces requirements, which when fulfilled, solve the problem in its entirety for the user This is almost always false, for any non-trivial project, within the usual commercial constraints of money and time.