[] () used to describe a way of developing a new product where the process is divided into separate stages. At the end of each stage managers must make a decision about whether and how to continue.阶段─关卡流程(用以分阶段开发新产品的一种方法)⨁a stage-gate model / process / review / system阶段─关卡流程模型/过程/审查/体系