Appendix C: Cost Estimating Methodologies - NASA

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

Assuming a linear relationship between power and cost, and assuming also that power is a cost driver of solar array cost, the single-point analogy calculation can be performed as follows: Solar Array Cost for System B = 3.4/2.3 * $10M = $14.8M Complexity or adjustment factors can also be applied to an analogy estimate to make allowances for year

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