In Scrum projects, User Stories are ranked in order of priority which is an effective method for determining the desired User Stories for each iteration or release of the product or service. The purpose is to create a simple, single list with the goal of prioritizing features, rather than being distracted by multiple prioritization schemes.
This simple list also provides a basis for incorporating changes and identified risks when necessary. Each change or identified risk can be inserted in the list based on its priority relative to the other User Stories in the list. Typically, new changes will be included at the expense of features that have been assigned a lower priority.
Minimum Marketable Features (MMF) are also defined, so that the first release or iteration happens as early as possible, leading to increased ROI.