I modified the title to convey the importance to the readers. It was an early paper on managing software projects with all that came with that. The process the author pushes is iterative. However, someone decided to clip out the first, incorrect process with waterfall-like diagram to show to all kinds of business people. Waterfall methodology was born. It wasn’t the technical people, though, who had already invented iterative software in the SAME PAPER! Especially see “dang’s” link to rest of the story.