All agile enthusiasts swear by user stories as user stories are succinct, are told from a user's perspective, contain the user expectation from the system and contain the value the requirement provides.
However, even for a small size project, the number of user stories can sometimes be quite large.
In a recent project, I worked with about 10 members for 3 months, and we had more than 300 user stories developed.
Most agile books suggest a 2 tier structure for managing agile requirements - namely, Epics and Stories.
But, will this be good enough for a slightly larger project where the user stories can easily cross 1000?
For such big projects with a large number of user stories, I am proposing a 4 tier structure:
We can call this Feature or Module.
Our good old friend - Epic
Our perennial favorite User stories
Acceptance and Done criteria
Feature and Epic could spread over sprints whereas user stories and acceptance criteria should be completed in one sprint.