This feature buffering process is consistent with that used in the agile process, DSDM (Dynamic Systems Development Method). On DSDM projects, requirements are sorted into four categories: Must Have, Should Have, Could Have, and Won’t Have. DSDM refers to this sorting as the MoSCoW rules. No more than 70% of the planned effort for a project can be targeted at Must Have requirements. In this way, DSDM projects create a feature buffer equivalent to 30% of the duration of the project.
