11 2019W_SOEN_341_week6.2_estimation.pptx

Development flexibility reflects the degree of

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Development flexibility Reflects the degree of flexibility in the development process. Very low means a prescribed process is used; extra-high means that the client sets only general goals. Precedentedness Reflects the previous experience of the organization with this type of project. Very low means no previous experience; extra-high means that the organization is completely familiar with this application domain. Process maturity Reflects the process maturity of the organization. The computation of this value depends on the CMM Maturity Questionnaire, but an estimate can be achieved by subtracting the CMM process maturity level from 5. Team cohesion Reflects how well the development team knows each other and work together. Very low means very difficult interactions; extra-high means an integrated and effective team with no communication problems. 10/12/2014 21
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Multipliers (AKA cost drivers) Product attributes Concerned with required characteristics of the software product being developed. Computer attributes Constraints imposed on the software by the hardware platform. Personnel attributes Multipliers that take the experience and capabilities of the people working on the project into account. Project attributes Concerned with the particular characteristics of the software development project. 10/12/2014 Chapter 23 Project Planning 22
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The effect of cost drivers on effort estimates Exponent value 1.17 System size (including factors for reuse and requirements volatility) 128,000 DSI Initial COCOMO estimate without cost drivers 730 person-months Reliability Very high, multiplier = 1.39 Complexity Very high, multiplier = 1.3 Memory constraint High, multiplier = 1.21 Tool use Low, multiplier = 1.12 Schedule Accelerated, multiplier = 1.29 Adjusted COCOMO estimate 2,306 person-months 10/12/2014 Chapter 23 Project Planning 23 The values taken are  from the COCOMO II  reference manual
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The effect of cost drivers on effort estimates Exponent value 1.17 Reliability Very low, multiplier = 0.75 Complexity Very low, multiplier = 0.75 Memory constraint None, multiplier = 1 Tool use Very high, multiplier = 0.72 Schedule Normal, multiplier = 1 Adjusted COCOMO estimate 295 person-months 10/12/2014 Chapter 23 Project Planning 24
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Key points Estimation techniques for software may be experience-based, where managers judge the effort required, or algorithmic, where the effort required is computed from other estimated project parameters. The COCOMO II costing model is a mature algorithmic cost model that takes project, product, hardware and personnel attributes into account when formulating a cost estimate. 10/12/2014 Chapter 23 Project Planning 25
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roject-Cost-Estimates-Using-COCOMO-II-Mo 00.0/CII_manual2000.0.pdf 10/12/2014 Chapter 23 Project Planning 26
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