Bottom-up Estimating (Definition)

Approximating the size (duration, effort and cost) and risk of a project (or phase) by breaking it down into activities, tasks and sub-tasks, estimating the effort, duration and cost of each and rolling them up to determine the full estimate. Determining duration through a bottom-up approach requires sequencing and resource levelling to be done as part of the scheduling process. Best performed by those actually intended to do the work, or those with the same skill sets required for that work.


Last Reviewed: 08 February 2018

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