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

(Wimincken.com 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 )

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 Paradigm-360.com, 360 Difference Mac4Construction.com,iOS4Construction.com and now TheBuildingAndRemodelingWiki.com too.
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