Nice waterfall quote from Martin Fowler

Requirements are the things that you should discover before starting to build your product. Discovering the requirements during construction, or worse, when you client starts using your product, is so expensive and so inefficient, that we will assume that no right-thinking person would do it, and will not mention it again.

—Suzanne and James Robertson

“…liking [this quote] isn’t connected to agreement. I like this quote because it sums up the waterfall value system to requirements (indeed the word ‘requirement’ is inherently waterfallish).” [Martin Fowler in MF Bliki: ObservedRequirement:]