Waterfall is just a mapping of the dependency graph back into work-packages. As all things are hierarchical in some way, large changes and additions, always le

Waterfall is just a mapping of the dependency graph back into work-packages. As all things are hierarchical in some way, large changes and additions, always lead to a larger change allover the graph, making it necessary to go all the steps back. Change something large enough, and the process forces you back to the architecture drawing board.