Chapter 14: Using Earned Value Management in Software (Web design tools)
Chapter 14: Using Earned Value Management in Software Projects 293 Whoop-dee-doo! What does this mean to a software project? Calculating PV, AC, and EV, along with vari-Similarly, if your SPI is 1, your schedule is 100 ances, enables you to determine whether your percent where it should be. So, if the SPI is project is on the right path. These calculations greater than 1, that s good. If your SPI is less help you to predict how your software project than 1, that s bad. For example, an SPI of 1.25 will progress based on where you are now. The indicates that the project is performing at a rate variances compare where you are with where of 125 percent, and if your SPI is .99, the project you expected to be. is performing at 99 percent of where you expected to be with regards to the schedule. Now that you know how to calculate all of these numbers, what does that mean? A CPI What does all this mean to your software proof 1 means that your project is costing you ject? These calculations are necessary to exactly what you planned for it to cost. So, determine if you are over- or underbudget and if logically, if the CPI is less than 1, you are spend-you are over or behind on your schedule. This ing more than you expected, and if your CPI is gives you the information you need to determine greater than 1, you are spending less than you if your variance is enough to make significant expected. For example, if your CPI is 1.25, you re changes such as increasing the number of pro- getting $1.25 for every dollar that you expected. grammers or revising timelines. If your CPI is .99, you re getting 99 cents for every dollar that you expected. If your CPI is 1, then your project is right where you expected it to be. If your CPI is greater than 1, your project is doing better than you expected; you re getting more than a dollar for every dollar that you expected to earn. If your CPI is less than 1, you are not getting as much as you expected on your project. In our example, you are earning less than $1.00 for every dollar you expected to earn. Still, 96 cents isn t too far from the mark. Calculating your Schedule Performance Index (SPI) SPI answers the question, Where are you in the schedule compared to where you expected to be at this point in time? To calculate your SPI, you divide EV by the PV. Here s an example, with some made-up numbers: SPI = EV PV EV = $24,000 PV = $30,000 EV PV = 0.8
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