>Perfect example of unclear formulated goal of the project That was exactly my point. >And if you now accept that any of those above goals may be changed into

>Perfect example of unclear formulated goal of the project That was exactly my point. >And if you now accept that any of those above goals may be changed into another during project runtime, you understood why waterfall is not often the best idea. I think you missed the entire idea of my comment. There is no sense in accepting that those goals will change and trying to start a project that aims to achieve one of them. They are too ambitious and broad in scope and need to be broken into smaller pieces (see Apollo program or SpaceX roadmap - both are focusing first on smaller objectives, that will clarify the next steps).