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From Use Cases to User Stories: The 3Cs, INVEST and When Use Cases Are Still Better

A use case is the map showing the whole and its branches, while a user story is a unit of delivery from that map that gives value on its own; not every alternative flow has to become a story. We split Bookstore's institutional order use case into seven stories and acceptance conditions, covering Jeffries' card-conversation-confirmation trio, the limits of the "As a / I want / so that" template, the INVEST check, epics versus stories versus tasks, and when use cases are still better.