The concept of writing user stories, as a way of documenting requirements, was introduced and popularized with Extreme Programming, and then picked up by Scrum and several other agile methods. Nowadays, for many agile developers, a project without user stories would be like a world without pizza. Impossible to imagine.
User Stories Applied
The book User Stories Applied, published in 2004 by Mike Cohn, is a landmark publication that has brought together everything the agile movement has learned about this important subject. Mike's book deals with all the activities that people have to perform when writing user stories, like techniques for requirements gathering, defining roles, working with user proxies, and preparing for acceptance testing. Mike also clearly explains how user stories can play a pivotal role in the wider agile project management processes of estimating, planning and monitoring.

