Transcription of Appendix C: Cost Estimating Methodologies
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Appendix C: Cost Estimating Methodologies
NASA Cost Estimating Handbook Version Appendix C Cost Estimating Methodologies C-1 February 2015 Appendix C: Cost Estimating Methodologies The cost estimator must select the most appropriate cost Estimating methodology (or combination of Methodologies ) for the data available to develop a high quality cost estimate. The three basic cost Estimating methods that can be used during a NASA project s life cycle are analogy, parametric, and engineering build-up (also called grassroots ) as well as extrapolation from actuals using Earned Value Management (EVM). This Appendix provides details on the following three basic cost Estimating methods used during a NASA project s life cycle: Analogy Cost Estimating Parametric Cost Estimating Simple Linear Regression (SLR) Models Simple Nonlinear Regression Models Multiple Regression Models (Linear and Nonlinear) Model Selection process Summary: Parametric Cost Estimating Engineering Build-Up Cost Estimating (also called Grassroots ) Estimating the Cost of the Job Pricing the Estimate (Rates/Pricing) Documenting the Estimate Basis of Estimate (BOE) Summary: Engineering Build-Up Cost Estimating For additional information on cost Estimating Methodologies , refer to the GAO
Software development Statistically sound predictors that ... the process as possible, to document the rationale for adjustments, and to ensure that the estimate is ... characteristics, contractor output measures, or personnel loading) to develop one or more cost estimating relationships (CERs). Generally, an estimator selects parametric cost ...
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