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 Cost Estimating and As

money) required to create a build-up estimate; Susceptible to errors of omission/double counting Production estimating Negotiations Mature projects ... A traditional complexity factor is a linear multiplier that is applied to the subsystem cost produced by a cost model. In its simplest terms, it is a measure of the complexity of the

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