Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A parametric model is a set of related mathematical equations in which alternative scenarios are defined by changing the assumed values of a set of fixed coefficients. Software project managers use software parametric models or parametric estimation tool to produce estimates of a project's duration, staffing and cost. The early 1980's saw the emergence of several software estimation models. These included the refinement of earlier models, such as PRICE S and SLIM, and the development of new models, such as SPQR, Checkpoint, ESTIMACS, SEER-SEM or COCOMO and its commercial implementations PCOC, GECOMO, COSTAR and Before You Leap.

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