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Unformatted text preview: n Figure 2 -19. TE
Figure 2-18. Schedule for the Foundation control package. AM FL Y
Team-Fly® Figure 2-19. Start and end dates for Foundation control package. These start and end dates can now be manually entered into the example database. To enter these start and end dates, use the Task Entry/Edit tool that was previously discussed in Section 2.3.3 (see Figure 2-8). Enter the start and end dates shown in Figure 2-19 into the Original Start and Original End fields of the Task Entry/Edit tool for each task shown in Figure 2- 19. Also, for now, you can enter these same start and end dates into the Client Start and Client End dates, into the Control Start and Control End dates, and into the Forecast Start and Forecast End dates. In Chapter 3 we explain how to determine start and end dates for these other budgets more accurately. If you do not enter these dates for the client dates, the control dates, and the forecast dates, no harm will be done. If Modern Project gets to a point where it needs dates for these other budgets and the forecast and none have been entered, it automatically inserts these start and end dates into the Client, Control, and Forecast schedules, also, because at the beginning of a project there are no deviations from the project plan and all of these budgets and the forecast are the same. It remains to explain the mechanics of time phasing the budget by the schedule. It is important to understand how it is done, even though Modern Project does it for you automati- Page 61 cally. Time phasing is first computed at the work package level and then rolled up to obtain the time phasing at the higher control package levels. This rollup is more complex than the rollup for budget or schedule data individually. To time-phase a work package is to compute the pattern (graph) of the expenditure of resources (labor-hours) during the time period between the start date and the end date of the work package. This pattern is often referred to as a spread curve. There are several possible types of spread curves. Perhaps the simplest is to assume that the budget for each task in the work package is expended in one lump at the time of completion of the task. This assumption generates a step function spread curve, as shown in Figure 2 -20 (a). Another type of spread curve is based on the assumption that each task has a uniform (or constant) rate of expenditure during the time interval between its start date and its end date. This leads to what is called a linear approximation function spread curve, as shown in Figure 2 -20 (b). In the (infrequent) case where a single work package has a substantially larger budget than average and is not of short duration (such as an overhead work package), the "spreading" of the work package budget can be handled in a more sophisticated manner. Instead of developing the spread curve from the estimate for each task, as in cases 2-20(a) and 2-20(b), the spread curve can be based on historical information about the distribution of labor- hours (or costs) on...
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This note was uploaded on 01/11/2011 for the course ACC 9 taught by Professor Yeetan during the Spring '10 term at Sunway University College.
- Spring '10