292 Part IV: Controlling Your Software Project You (Web hosting india)
292 Part IV: Controlling Your Software Project You can probably guess that because you have a negative number for your VAC, the current numbers indicate that the project will cost more than you originally planned. A positive number for your VAC indicates that your project is going better than you expected. A value of 1 indicates that you re right on budget. Finding your cost and schedule performance indexes You can do several calculations to determine whether your software project is progressing as efficiently as you and your stakeholders expected. Use these performance indexes to trend your project s performance and predict how efficient your project will be for the duration. An index indicates how efficiently your project is progressing and may be used to predict your project s future performance. Table 14-4 summarizes the index formulas we describe in the following sections. Table 14-4 Index Formulas Index Formula Cost Performance Index (CPI) CPI = EV AC Schedule Performance Index (SPI) SPI EV PV Calculating your Cost Performance Index (CPI) Cost Performance Index (CPI) answers the question, How much are you getting for each dollar you are spending on your project? To determine CPI, divide the earned value by your actual cost: CPI = EV AC. For example, if your earned value is $24,000 and your actual cost is $25,000, finding your CPI looks like this: CPI = EV AC EV = $24,000 AC = $25,000 EV AC = 0.96 Okay, now that you have your CPI, what does it mean? It means that you re getting $0.96 for each $1.00 that you expected to earn.
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