Having lived through a variety of methodologies, all of which were taken very seriously and equally successful, this rings true. The one thing I would maybe ad

Having lived through a variety of methodologies, all of which were taken very seriously and equally successful, this rings true. The one thing I would maybe add is that the tools of the trade have changed for the better in thirty years, particularly source control management, document tracking, and the ability to collaborate remotely. I think ways of development have changed in response to that. Imagine a world where compiling a build of a piece of software took as a long as an hour, source code was stored on a single server so that you didn't even want to have two people working on the same set of code, automated testing didn't exist.. I can remember cases of that in my youth. It seemed to call for more planning and a more top down approach.