Thoughts and Perceptions on Agile, Lean and related software development methods There are several ways to prioritize the requirements in the backlog. Some of the most popular ones include, MoSCoW M - MUST have this. S - SHOULD have this if at all possible. C - COULD have this if it does not effect anything else. W - WON'T have this time but would like in the future. Each requirement will have the