Meanwhile, an '80s paper countering 'waterfall' with prototyping iterations called it the 'spiral method'.
https://en.wikipedia.org/wiki/Spiral_model
FWIW, the early '70s paper the DOD misunderstood as suggesting 'waterfall' had already said the right way was to build one to throw away -- but use the prototype to derive the usability, requirements, and design docs first.
Meanwhile, an '80s paper countering 'waterfall' with prototyping iterations called it the 'spiral method'.
https://en.wikipedia.org/wiki/Spiral_model
FWIW, the early '70s paper the DOD misunderstood as suggesting 'waterfall' had already said the right way was to build one to throw away -- but use the prototype to derive the usability, requirements, and design docs first.