Writing user stories

At its core, a user story describes something that the user wants to accomplish using the software product. User stories originated as a part of the Agile and Scrum development strategies, but, for designers, they mainly serve as reminders of user goals and a way to organize and prioritize how each screen is designed.
For Agile product teams, a user story is the gold standard for communicating product requirements to all team members. They're brief, specific, and quickly understood.
The following are some ways to test the user story:

• Is it something a real user would say?
• Does it help you to design and prioritize?
• Does it unnecessarily constrain possible solutions?

Take a look at the following diagram: