需求管理(Requirements Management, REQM)的目的，在于管理专案产品及产品组件的需求，并界定这些需求与专案计划及工作产品间的差异。

Requirements management is the process of documenting, analyzing, tracing, prioritizing and agreeing on requirements and then controlling change and communicating to relevant stakeholders. It is a continuous process throughout a project. A requirement is a capability to which a project outcome (product or service) should conform.