Bottom-up Estimating

Bottom-up estimating is a process of estimating individual schedule activities or costs and then aggregating these together to come up with a total estimate for the work package. Every schedule activity is estimated individually and all individual estimates are added together, to come up with a total. The accuracy of these estimates is proportional to the accuracy of the estimates at the schedule activity level which in turn depend on the size, complexity and detailed understanding of the schedule activity.

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