掙值法外文翻譯word版(編輯修改稿)
2024-09-17 22:41 本頁面
【文章內(nèi)容簡介】 be acplished with the variables already defined. The percent plete (PC) is simply the ratio BCWP/BAC, expressed as a percent. Note that this assessment merely defines the percent pletion based on original estimates and is not influenced by actual cost figures. Another way of viewing earned value (BCWP) is gives in the following expression:Earned Value=(PC)(BAC)The percent pletion can be pared with the expected or anticipated percent pletion at a given point in time. The planned percent plete (PPC) is derived at a point in time with the ratio BCWS/BAC, expressed as a percent. The PPC is easy to grasp as a measure of the project status when pared to the PC. For example, if the PPC is determined to be 60% and the PC is determined to be 65%, it is clear that the project is running ahead of schedule.Information on the cost index and how it has changed over time can be used to forecast what the costs will be at the end of the project, referred to as Estimated at Completion (EAC). The forecast of the EAC can also be obtained at a given point in time with the variables that have already been defined. A simple putation of the EAC at a given point in time is puted as follows:EAC=ACWP+ (BACBCWP) where BACBCWP represents unearned hours The EAC is the latest revised of the total cost of the project and can be pared to the BAC (original estimated project cost) to determine an estimated At Completion Variance (ACV). Since the EAC is based on costs incurred to date, this estimate will be accepted as being more accurate than the BAC. The ACV is a simple putation and provides an estimate of the amount (ACVEAC). Id ACV1, the project is expected to overrun or exceed the budget. Because of the importance of the value of ACV, it is important that the determination of EAC be as accurate as possible. The projection of EAC may use a cumulative average CPI, the CPI for the most recent period, or some other selected figure. Applying the selected CPI ratio to the BAC value will yield an estimated EAC (EAC=BAC/CPI).ExampleA simple problem will help to illustrate the application of the principles of earned value. A project has been defined that consists of 12 activities (each requires one month to plete) for which the estimated costs and durations have been defined (see Figure ).The project costs are estimated to $257,000(BAC = sum of the costs of all activities). The project is scheduled to be pleted in six months. After three and a half months, the site work, excavation, foundation, fencing, and rough electrical work are pleted. The framing is onehalf plete
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