Phase (Hybrid) Estimating

last edited by: Pang DX on Dec 8, 2018 10:22 AM login/register to edit this page


This hybrid estimation technique of a project’s costs and duration begins with a top-down approach and then progressively improves the estimates for the project phases as they are implemented. Some projects by their nature cannot be thoroughly defined because of the uncertainty of product designs and configurations due to market volatility of supply and demand.

These projects are often found in aerospace, new technology, and construction projects where designs and configurations are prone to changes among teams and departments throughout the project phases. Hence, in these projects, estimating by project and product phases is used to forecast costs and duration more accurately.

Phase estimating is typically used when high fluctuations surround a project and it is impractical at the start to forecast costs and duration for the entire project. Phase estimating uses a two-estimate systema detailed (micro) estimate is made for the immediate stage and an overview (macro) estimate is made for the remaining stages. The accuracy of estimate is progressively being refined with fewer fluctuations of requirements as the project progresses.

Stakeholders in the internal and external environment often want accurate and firm schedules’ and costs’ estimates of entire or majority of the project prior to implementation. We need to explain to stakeholders and ensure they realize the benefits of phase estimating – accurate estimates progressively made in stages to cope with the uncertainty of product designs and fluctuations of project or market requirements, as well as opportunities to enhance product features and re-evaluate the project requirements.

--References-- Erik W.Larson & Clifford F.Gray (2014: 141-42): Project Management: The Managerial Process, 6th Edition, New York: McGraw-Hill.


last edited by: Pang DX on Dec 8, 2018 10:22 AM login/register to edit this page


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