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copied!<p>Use Cases are more like a <a href="http://en.wikipedia.org/wiki/Design_by_contract" rel="nofollow">contract</a> while Use Stories are a planning tool. Consequently, Use Cases usually outlive User Stories since they (should) serve as documentation that concretely reflects the built system.</p> <p>User stories are written by the customer/stakeholder/client/user. User stories aren't very detailed and are relatively open to interpretation.</p> <p>Use cases are more formal in structure and are often written by a someone on the team - requirements engineer/product manager. They are often more detailed, breaking down an interaction into individual steps, and clearly identifying pre-conditions and post-conditions such as failure conditions and success conditions.</p> <p>While one Use Case can cover many scenarios - success and failure; validation errors; sub use-cases and extensions - a User Story is more limited in scope, usually describing a single scenario.</p> <p>See also <a href="https://en.wikipedia.org/wiki/User_story#Comparing_with_use_cases" rel="nofollow">User_story#Comparing_with_use_cases on Wikipedia</a>, as well as the chapter "What Use Cases are Not" in the book <a href="http://rads.stackoverflow.com/amzn/click/0321205685" rel="nofollow">User Stories Applied</a>.</p> <p>Lastly, <a href="http://alistair.cockburn.us/Stop+confusing+use+cases+and+user+stories" rel="nofollow">according to Allistair Cockburn...</a></p> <blockquote> <p>A user story is synonymous with “feature” as used in the 1990s, a marker for what is to be built, fine-grained enough to fit into modern iteration/sprint periods.</p> <p>A use case provides a contextual view of what is to be built, serving to bind the organization together, among other things.</p> </blockquote>

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