Cocomo Model

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A brief on cocomo
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  COCOMO Model By, Amisha Singh S Ashwin Kumar Rajan Prashant Begwani  History ã The srcinal COCOMO stands for Constructive Cost Model  . The word constructive implies that the complexity of the model can be understood because of the openness of the model, which permits exactly to know WHY the model gives the estimates it does. ã The model was first published by Dr. Barry Boehm in 1981, and reflected the software development practices of these days. ã Some of the changes were moving away from mainframe overnight batch processing to real time applications, strenuousness in effort in building software for reusing, new kind of system development in including off-the-shelf software components (COTS) and spending as much effort on designing and managing the software development process as was once spent creating the software product. ã These changes urged to revise the existing model. ã By the joint efforts of USC-CSE (University of California,Center for Software Engineering) and the COCOMO II Project Affiliate Organizations the COCOMO II model was presented, which should remedy all deficiencies.   AFFILIATES ã The work for COCOMO II has been supported financially and technically by the COCOMO II Program Affiliates: ã Aerospace, Air Force Cost Analysis Agency, Allied Signal, DARPA, DISA, Draper Lab, EDS, E-Systems, FAA, ã Fidelity, GDE Systems, Hughes, IDA, IBM, JPL, Litton, Lockheed Martin, Loral, Lucent, MCC, MDAC, Microsoft, ã Motorola, Northrop Grumman, ONR, Rational, Raytheon, Rockwell, SAIC, SEI, SPC, Sun, TASC, Teledyne, TI, ã TRW, USAF Rome Lab, US Army Research Labs, US Army TACOM, Telcordia, and Xerox.  COCOMO I ã In this section the model of COCOMO I also called COCOMO'81 is presented. The underlying software lifecyle is a waterfall lifecycle. ã Boehm proposed three levels of the model: basic, intermediate, detailed .    Basic : COCOMO'81 model is a single-valued, static model that computes software development effort (and cost) as a function of program size expressed in estimated thousand delivered source instructions (KDSI).   The intermediate COCOMO'81 model computes software development effort as a function of program size and a set of fifteen cost drivers that include subjective assessments of product, hardware, personnel, and project attributes.   The advanced or detailed COCOMO'81 model incorporates all characteristics of the intermediateversion with an assessment of the cost driver’s impact on each step (analysis, design, etc.) of the software engineering process.
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