上游充通大￥ SHANGHAI JIAO TONG UNIVERSITY There are many different types of requirements at different levels of detail The number of requirements can become unmanageable if they're not controlled. Requirements are related to one another and also to other deliverables of the software engineering process. Requirements have unique properties or property values. For example,they are not necessarily equally important nor equally easy to meet. There are many interested parties,which means requirements need to be managed by cross-functional groups of people. Requirements change. Software EngineeringSoftware Engineering There are many different types of requirements at different levels of detail. The number of requirements can become unmanageable if they're not controlled. Requirements are related to one another and also to other deliverables of the software engineering process. Requirements have unique properties or property values. For example, they are not necessarily equally important nor equally easy to meet. There are many interested parties, which means requirements need to be managed by cross-functional groups of people. Requirements change