Bottom-Up Estimating

This estimation technique is used to aggregate the duration or cost from the lower level of the WBS structure. Individual activities aggregated to work packages. If it is difficult to estimate at activity level then further the activity is decomposed to more detail. And estimation is done at these detail level and aggregated to activity level.

Bottom-Up Estimating is the most accurate estimation technique but is time consuming.

Bottom-Up Estimating technique is used under the processes Estimate Activity Resources and Estimate Costs.