278 Part IV: (Email web hosting) Controlling Your Software Project
278 Part IV: Controlling Your Software Project What are the implications for the system testing if we do implement this change request? In other words, when you implement a change to your software project, you not only have to test that particular code, but you need to test other areas of your application that may be affected. Also, you need to extend the schedule in order to accomplish all the testing. If we implement this particular change, what other areas of the actual project will we be affecting? Consider each of those areas to determine whether you need to change the project schedule. Are there other changes in the project that I can implement in order to reduce the impact of this particular change? For example, if you move forward with this change, you can prevent schedule delays by adding a programmer to a portion of the project. Is there enough positive impact in implementing this change that can counteract the negative implications? For example, maybe you add three weeks to your schedule, but the actual change will increase the value of the product. Forecasting schedule variances In Chapter 14 we discuss Schedule Performance Index (SPI), which is used to trend the performance of your project and allows you to forecast how efficient your project is operating. Determining your SPI permits you to forecast schedule variances. We don t want to ruin your fun in reading Chapter 14, so we won t go into painstaking detail on SPI and trend analysis, but we do want to whet your appetite. Forecasting schedule variances enables you to look ahead to determine whether you re on schedule. Having this knowledge provides you with an opportunity to show your creative talents and start defining corrective action to bring the project schedule back in line with your plan. In a previous portion of this chapter we showed you how to calculate your earned value, actual costs, and cost variance to determine whether your actual costs were in line with your plan. There are some similar formulas to use for forecasting schedule variances. Here they are: If you know your planned value (PV) and you know your earned value (EV), then you can calculate your schedule variance (SV). Your PV indicates, for a particular period, how much work was supposed to be completed.
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