An estimating method where the base costs of individual work items or resources are calculated into task, resource, and project cost totals.

( PM Glossary)

Other Definitions

Bottom Up Estimating – Overall estimates for the project are built up from the detailed level and aggregated to give totals for the project as a whole. The opposite of Top Down.

(Wideman Comparative Glossary of Common Project Management Terms v2.1 )

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J. Jerrald Hayes
I am ex-architectural woodworker and general contractor turned IT, Business and Project Management consultant, software developer wannabe senior division triathlete and ski racer, Yankee fan and founder of, 360 Difference, and now too.
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