COCOMO Software Cost Estimating Model
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COCOMO Versions

CO (Constructive) CO (Cost) MO (Model)
First version: 1981 by Dr. Barry Boehm
-Now known now as “COCOMO 81”
Second version: ADA Cocomo (ADA 87); parameterized exponent reflecting more modern practices and their economies of scale.
Current Version: Cocomo II (circa 2000)
Commercial take-offs
-Costar (Softstarsystems.com)
-Cost Xpert (CostXpert.com)
Regression formula, with data taken from historical projects and current project characteristics.


Bittner email cont’d


.Inception phase: driven by business/exploratory technology issues; generally defies estimation (because so little data exists at the beginning of a project).
.Elaboration phase: driven by technical risks and exploration of technology issues.
.Transition phase: not largely governed by software economics but is affected by a large number of factors other than software development.