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This thesis is a case study that compares actual costs to estimated costs for a state-of-the-Art (SOA) extension. The Advanced Nuclear Gamma-Ray Spectrometer (ANGAS) program initiated by the Defense Advanced Research Project Office (DARPA) in conjunction with the Research and Development Division of Lockheed Missiles and Space Company (LMSC), Inc. is the subject of this case study. This thesis identifies: the original description of the technology extension; the methods used at Lockheed to develop SOA extension cost estimates; specific factors that helped and hindered accurate cost estimating and significant variances in cost and technological progress. Keywords: Cost estimating models; Technological measurement; Variance analysis.