An Evaluation of Software Cost Estimating Models.

Abstract
Nine software cost estimating models are evaluated to determine if they satisfy Air force needs. The evaluation considers both the qualitative and quantitative aspects of the models' outputs. Air Force needs for cost estimates are established by the Major Weapon System Acquisition Process. Associated with the different development phases are five cost estimating situations. Decisions that are made early in the Acquisition Process require software cost information that includes the entire life cycle for complete software systems, subsequent decisions require more detailed cost information. Comparison of the outputs of the nine test models with the requirements established by the five cost estimating situations indicates that the models are able to satisfy only the needs of the earliest phase of the Acquisition Process. The models perform satisfactorily for the purpose of allocating funds for software acquisition, but they fail to support such needs as assessment of alternative designs, proposal evaluation, or project management.

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