![]() In this case, add in the appropriate products and services and proceed as usual. The task needs specialty products or services that the last one didn’t.This might sound obvious but it’s not the big, obvious things that cause problems for project managers, it’s the little things, and you have to make sure you include enough contingencies for them. For example, the log house has slightly more square footage, or the driveway is longer, or several more windows have been added. Scale the duration up or down by the appropriate amount. The task is bigger or smaller than the last one. ![]() For each task, however, you often have to make some adjustments. In fact, many companies have numerous similar projects, and this is the natural starting point. For our log home example, previous projects provide an excellent comparison to determine resources, costs and durations. This is the best source of information because actual work completed is extremely reliable, even if it requires adjustments. The four types of estimates are:Īs the name suggests, this is when you make an analogy to the same, or similar, task that has been performed before. On this page we will expand them, work through them, and add one more. On the previous page we listed the three main types of estimates. The resource calendar can range from a simple listing of workers’ availability to full calendar within project management software that tracks employees schedules. Obviously, the new project being planned cannot use this worker at that time (unless arrangements are made with the other project manager, I suppose). This states the availability of a resource, for example, To determine the availability of resources, a project manager consults a document called a resource calendar. ![]() The key benefit of this process is that it provides the amount of time each activity will take to complete, which is a major input into the Develop Schedule process. PMBOK, 5th Edition, Section 6.5, “Estimate Activity Durations”Įstimate Activity Durations is the process of estimating the number of work periods needed to complete individual activities with estimated resources. ![]()
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