Scrum

Software development methodology.

User story

Agile modeling

http://www.agilemodeling.com/artifacts/userStory.htm

User stories are very slim and high-level requirements artifacts.

As a (role) I want (something) so that (benefit).

• Students can purchase monthly parking passes online.
• Parking passes can be paid via credit cards.

• Parking passes can be paid via PayPal.

Extreme programming

Deliver the software you need as you need it.

Extreme Programmers constantly communicate with their customers and fellow programmers.

http://www.extremeprogramming.org/rules.html

http://www.extremeprogramming.org/rules/userstories.html

User stories should only provide enough detail to make a reasonably low risk estimate of how long the story will take to implement.

When the time comes to implement the story developers will go to the customer and receive a detailed description of the requirements face to face.

You should try to keep stories focused on user needs and benefits.