Title: agile - What are the definitions and differences between: Theme, Epic, Feature, User Story and Task? - Project Management Stack Exchange
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What are the definitions and differences between: Theme, Epic, Feature, User Story and Task?
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Content: If I tell you a  particular movie was an "action-adventure movie" that tells you  something about the movie. There's probably some car chases, probably  some shooting, and so on. It tells you this even though there is no  universal definition that we've agreed to follow, and that an  action-adventure movie must contain at least three car chases, at  least 45 bullets must be shot, and …. So, "epic" is just a label we apply to a large story. Calling a story  an epic can sometimes convey additional meaning. Suppose you ask me if  I had time yesterday to write the user stories about the monthly  reporting part of the system. " Yes," I reply, "but they are mostly  epics." That tells you that while I did write them, I didn't get the  chance to break most of them down into stories that are probably small  enough to implement directly. Finally, " theme " is a collection of user stories. We could put a  rubber band around that group of stories I wrote about monthly  reporting and we'd call that a "theme."