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Validating software estimates

Future effort estimates are made by providing size and calculating the associated effort using the equation which fit the original data (usually with some error).

The Constructive Cost Model (COCOMO) is an algorithmic software cost estimation model developed by Barry W. The model uses a basic regression formula with parameters that are derived from historical project data and current project characteristics.

Future effort estimates are made by providing size and calculating the associated effort using the equation which fit the original data (usually with some error). the Putnam model describes the time and effort required to finish a software project of specified size.

The Putnam model is an empirical software effort estimation model. Putnam published in 1978 is seen as pioneering work in the field of software process modelling.

As a group, empirical models work by collecting software project data (for example, effort and size) and fitting a curve to the data.

SLIM (Software LIfecycle Management) is the name given by Putnam to the proprietary suite of tools his company QSM, Inc. It is one of the earliest of these types of models developed, and is among the most widely used.

Closely related software parametric models are Constructive Cost Model (COCOMO), Parametric Review of Information for Costing and Evaluation – Software (PRICE-S), and Software Evaluation and Estimation of Resources – Software Estimating Model (SEER-SEM).

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Measures of calibration and discrimination undertaken in validation cohort.

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