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While managing R&D projects for the Army and later at GE, Putnam noticed software staffing profiles followedthe well-known Rayleigh distribution. 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). It is one of the earliest of these types of models developed, and is among the most widely used. 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. 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).Ĭreated by Lawrence Putnam, Sr. As a group, empirical models work by collecting software project data (for example, effort and size)and fitting a curve to the data. Putnam published in 1978 is seen as pioneering work in the field of software process modelling. The Putnam model is an empirical software effort estimation model. What Is Project Estimation In Software Engineering.Estimation determines how much money, effort, resources, and time it will take to build a specific system or product. Estimation is the process of finding an estimate, or approximation, which is a value that can be used for some purpose even if input data may be incomplete, uncertain, or unstable.
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Planning process in Software engineering. The staffing level is not changed continuously in a project.