Putnam model

The Putnam model is an empirical software effort estimation model.The original paper by Lawrence H. 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. 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 is an empirical software effort estimation model.The original paper by Lawrence H. 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. 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). Created by Lawrence Putnam, Sr. the Putnam model describes the time and effort required to finish a software project of specified size.SLIM (Software LIfecycle Management) is the name given by Putnam to the proprietary suite of tools his company QSM, Inc. has developed based on his model. It is one of the earliest of these types of models developed, and is among the most widely used. Closely related software parametric models areConstructive Cost Model (COCOMO), Parametric Review of Information for Costing and Evaluation – Software (PRICE-S), andSoftware Evaluation and Estimation of Resources – Software Estimating Model (SEER-SEM). While managing R&D projects for the Army and later at GE, Putnam noticed software staffing profiles followedthe well-known Rayleigh distribution.