[Metodo] metafora del metodo waterfall - comprare un vestito

da "How to Fail with the Rational Unified Process:
Seven Steps to Pain and Suffering":
<<
we would have to describe exactly what we want without ever seeing what we are getting; we could not even try the clothing on first to see how it looks.Every measurement would have to be specified precisely, months or years ahead of the actual time when we would receive the clothing. [...] Yet this is exactly how the waterfall method proceeds
>>