Top-down Cost Estimating is the preparation of a cost estimate by using judgment and experience to arrive at an overall total amount, usually done by an experienced estimator or manager making a subjective comparison of the project with similar previous projects.
(Wideman Comparative Glossary of Common Project Management Terms v2.1 )

Other Definitions

Top-down Estimating – An analogous estimating method that uses the actual costs of a previous, similar project as the basis for estimating cost totals of a current project. This method of applying cost totals is often used when there is a limited amount of detailed information about the project (such as in early phases of the project). ( PM Glossary)

Top-down Estimating – See Parametric Cost Estimating .

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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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