向开发案例中添加的每一项元素都应该根据期望的效益进行平衡，您需要考虑的方面包括：时间节省、质量获得，或为项目评估、计划和范围管理提供的基础。
Each addition to the development case should be balanced with the expected benefits in terms of time saving, quality gain, or providing a basis for project estimation, planning, and scope management.
当你评估一个计划、模型、文档或一些其他不可执行的表现物的美好和出色之处时，你只是在推测项目质量和进度。
As long as you are assessing the beauty or goodness of a plan, model, document, or some other nonexecutable representation, you are only speculating about quality and progress.
与此同时，项目经理为生成环境的质量目标，以及满足众多的计划时间点为烦心。
At the same time, project managers worry about incorporating quality goals into production, and meeting any number of scheduled dates.
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