Requirement attributes are data fields associated with each requirement that contain important project information. Each new RequisitePro requirement type is assigned default attributes by the system. For example, feature and supplementary specification requirements typically have the attributes Priority, Status, Cost, Difficulty, and Stability; a use-case requirement may have similar attributes as well as some that are unique, such as Affects Architecture, Property, and Planned Iteration. You can delete, modify, or add an unlimited number of other attributes appropriate to your project.