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在PERT与CPM的发展初期,主要目的是用以计算时间。把它当做编制计划的工具,能使管理人员估计完成一项拟建工程的时间。它们是一种进度安排技术。为施工进度确定工期。同时,是一种控制手段,便于管理人员按进度计划检查各作业项目延续的时间和事件发生的时间。的确,CPM包含费用——时间变化特征,但对费用进行考虑,仅仅是作为研究各作业延续时间的一种方法。在早期的CPM文献中,研究作业费用不是为了确定工程总费用的最优化,仅仅是为了预测或控制。因此,早
In the early stages of the development of PERT and CPM, the main purpose was to calculate time. Using it as a tool for planning can enable managers to estimate the time to complete a proposed project. They are a scheduling technique. The duration of the construction is determined. At the same time, it is a means of control to facilitate management personnel to check the duration of each project and the time of the event according to the schedule. Indeed, CPM includes cost-time variation characteristics, but cost considerations are only used as a way to study the duration of each operation. In the early CPM literature, the study of operating expenses was not intended to determine the optimization of the total cost of the project, but merely to predict or control. So early