A User Story is a tool used to provoke and summarize a conversation, between the Team and their Product Owner, for a better understanding of an item on the Product Backlog. The User Story provides context regarding who a Product Backlog Item is being developed for and why it is of value.
It’s important to note that this isn’t part of Scrum per se, but is a tool that grew up beside Scrum and is often used in conjunction. User Stories can be helpful but aren’t required as part of the practice of Scrum.
Life Cycle of a User Story
Story Slicing, How Small is Enough?
More Notes on Story Splitting
Vision to User Stories – What is the Best Flow?
Scrum By Example – The Team Collaborate on Acceptance Criteria
Scrum by Example – How to Deal with Bad User Stories as a ScrumMaster