Non-functional requirements relate to qualities of the system that cut across user facing features, such as security, reliability, and performance. How does an Agile team take care of these non-functional requirements? This presentation discusses if user stories are of any use in this situation and how Scrum teams can applying Agile techniques to solve these concerns.
Video producer: http://www.devopsdays.org/
Further reading: Non-Functional Requirements: Do User Stories Really Help?