What does a well-written user story describe?

A well-written user story is best characterized by describing the customers' perspective. This focus helps to ensure that the story reflects the user's needs and experiences, rather than just being a technical specification or an internal requirement. In Agile methodologies, particularly in Scrum, the user story is meant to articulate what the user wants to achieve with the product and why it is valuable to them. This perspective fosters a better understanding among the development team, aligning their efforts with delivering real value to the end users.

When user stories are centered on the customers' perspective, they encourage collaboration and communication among team members and stakeholders, ensuring that the product ultimately serves the target audience effectively. This approach aligns with Agile principles that prioritize customer satisfaction and responsiveness to change.

In contrast, the other options do not capture the essence of a well-written user story. A fixed outcome does not account for the iterative nature of Agile, which embraces adaptation. Describing the needs of all users can be overly broad and impractical, as it may dilute the focus on specific user experiences. Lastly, while the product owner's expectations are important, they should be framed in terms of user value, emphasizing the need for a customer-centric approach.