In agile development, a bloated backlog results from teams accumulating huge lists of requirements, usually in the form of user stories. Retaining every possible story for building the product weighs down the backlog while squeezing (or obscuring) the highest-value stories. The best way to help minimize this risk is to optimize the time spent defining and refining the product priorities.

You can use analytical methods to assign business value to a user story, of course, but another way is simple estimation. Allan Kelly describes an estimation exercise that combines the Scrum tool of planning poker with a TV show format to add some fun. You end up with enlightening conversation and revealed requirements.

Nonfunctional requirements describe aspects of the system that do not map onto a single piece of functionality. Essentially, they're constraints you need to operate within. Allan Kelly details how running performance tests regularly can be the key to nonfunctional requirements, as well as how much value these constraints produce.

Acceptance criteria can be helpful in expanding on user stories in order to capture requirements for agile projects. However, acceptance criteria should not be a route back to long, detailed documents, and they are not a substitute for a conversation. This article tells you how and when acceptance criteria should be written and employed.