The Waterfall Model: What Royce Actually Said in 1970
In his 1970 paper Royce drew the single-pass model but immediately called it risky, because problems such as timing and memory first appear in testing and force a redesign. We cover his five fixes (program design first, document it, do it twice, plan testing, involve the customer), the story of the name "Waterfall" and DOD-STD-2167, and how integration blows up in the last month of Bookstore's returns feature.
8 Nov 2026
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8 min
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6
