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This image depicts the main Costar Window with the Model notebook tab selected. The Select COCOMO Model button has been clicked to display the list of COCOMO models.
The Model window is used to select a traditional COCOMO or COCOMO II estimating model.
If you're new to Costar & COCOMO, you should probably use one of the first two models -- they're both COCOMO II.2000, but they use different phase models. The Waterfall model uses a fairly traditional set of phases, while the MBASE model uses phases comparable to the Rational RUP model.
The Early Design model is a COCOMO II model suitable for use during the early stages of a project, when relatively little is known about the project.
COCOMO_85 is essentially the traditional COCOMO 81 model described in Software Engineering Economics, and COCOMO_87 is a minor enhancement to the traditional model, with a couple of new cost drivers added.
Ada_87 and APM_88 are based on the Ada Process Model developed by Dr. Boehm as part of Ada COCOMO. Ada COCOMO has evolved into COCOMO II.
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