Learn in the textbookAgile Development and XP Practices
DefinitionA user story (ユーザーストーリー) is how Agile writes down requirements: a short sentence, from the user's point of view, saying who they are, what they want to do and why.
ExplanationEach story is short enough to fit on a single card, and the finer conditions are settled with users just before it is built. Writing down the reason keeps the builders from losing sight of whose problem the feature solves. Stories are ranked by priority and built from the top in each iteration.
AnalogyIt is like a diner telling a restaurant, "I can't handle spicy food, so I'd like something my child can eat too." The kitchen and the diner work out the recipe details together.
Memory hookStory as in a tale: the hero is always the user, and the builders or the system never take the subject's place.