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Incremental, Iterative and Spiral Models: Surfacing Risk Early

Incremental development adds the system part by part, iterative development builds the whole roughly and reworks it; Cockburn recommends using both together. We start Bookstore's checkout with a walking skeleton and grow it in slices, and cover Boehm's risk-driven Spiral model, throwaway vs evolutionary prototypes, RAD and RUP's four phases, together with the pitfall of mini-Waterfall disguised as iterations.