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.

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计划是经过协调统一管理以便获取单独管理时无法取得的效益和控制的一组互相联系的项目。

A program is a group of related projects managed in a coordinated way to obtain benefits and control not available from managing them individually.

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ERP是一个集合企业内部的所有资源，进行有效的计划和控制，以达到最大效益的集成化管理信息系统。

And erp is an integrated management information system which aggregates, plans and controls effectively all the resources inside an enterprise to get biggest benefit.

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