掙值法外文翻譯word版(存儲(chǔ)版)
【正文】 easier to interpret.CPI=BCWP/ACWP (CPI1: under budget, CPI1: over budget)It can be expected that these performance indices will show variations throughout the life of the project. Generally, it can be expected that the indices will be less than early in the project and rise as the project progresses. This is due to startup and “l(fā)earning curve” factors that normally inhibit efficient operations early in a project. If calculated separately for each time period, the values may also show a ragged series of peaks and values. Calculating a cumulative index from project start to date shows a smoother transition and over time should approach for a project that is close to schedule and budget.Figure Earned Value Analysis Showing a Project that Is Over BudgetDetermining the status of percent plete of a project can also 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 i
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