A convenient format for expressing the desired business value for many types of product backlog items. User stories are crafted in a way that makes them understandable for both business people and technical people. They are structurally simple and typically expressed in a format such as “As a <user role> I want to achieve <goal> so that I get <benefit>.” They provide a great placeholder for a conversation. Additionally, they can be written at various levels of granularity and are easy to progressively refine. See also epic, progressive refinement, theme, user role.