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Process-Based Cost Estimation for Ramjet/Scramjet EnginesProcess-based cost estimation plays a key role in effecting cultural change that integrates distributed science, technology and engineering teams to rapidly create innovative and affordable products. Working together, NASA Glenn Research Center and Boeing Canoga Park have developed a methodology of process-based cost estimation bridging the methodologies of high-level parametric models and detailed bottoms-up estimation. The NASA GRC/Boeing CP process-based cost model provides a probabilistic structure of layered cost drivers. High-level inputs characterize mission requirements, system performance, and relevant economic factors. Design alternatives are extracted from a standard, product-specific work breakdown structure to pre-load lower-level cost driver inputs and generate the cost-risk analysis. As product design progresses and matures the lower level more detailed cost drivers can be re-accessed and the projected variation of input values narrowed, thereby generating a progressively more accurate estimate of cost-risk. Incorporated into the process-based cost model are techniques for decision analysis, specifically, the analytic hierarchy process (AHP) and functional utility analysis. Design alternatives may then be evaluated not just on cost-risk, but also user defined performance and schedule criteria. This implementation of full-trade study support contributes significantly to the realization of the integrated development environment. The process-based cost estimation model generates development and manufacturing cost estimates. The development team plans to expand the manufacturing process base from approximately 80 manufacturing processes to over 250 processes. Operation and support cost modeling is also envisioned. Process-based estimation considers the materials, resources, and processes in establishing cost-risk and rather depending on weight as an input, actually estimates weight along with cost and schedule.
Document ID
Document Type
Conference Paper
Singh, Brijendra
(NASA Glenn Research Center Cleveland, OH, United States)
Torres, Felix
(NASA Glenn Research Center Cleveland, OH, United States)
Nesman, Miles
(Boeing Co. Canoga Park, CA, United States)
Reynolds, John
(Boeing Co. Canoga Park, CA, United States)
Date Acquired
August 21, 2013
Publication Date
June 17, 2003
Subject Category
Economics And Cost Analysis
Meeting Information
2003 Joint ISPA/SCEA Conference(Orlando, FL)
Funding Number(s)
WBS: WBS 22-706-88-04
Distribution Limits
Public Use Permitted.
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