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Software Estimation

Software Estimation. Software Cost Estimation Model. Over 50 vendors Examples: COCOMO, Checkpoint, Estimatics, KnowledgePlan, Price-S, ProQMS, SEER, Slim, Softcost, and SPQR/20. Simplest form of Estimation.

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Software Estimation

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  1. Software Estimation

  2. Software Cost Estimation Model Over 50 vendors Examples: COCOMO, Checkpoint, Estimatics, KnowledgePlan, Price-S, ProQMS, SEER, Slim, Softcost, and SPQR/20.

  3. Simplest form of Estimation • Record the amount spent in the planning Phase to predict the amount that will be spent in the rest of the project. • Industry standards suggest that typical business applications spend 15% of its effort in the planning, 20% in analysis, 35% in design and 30% in implementation. • What are the drawbacks of this method ?

  4. Alternative Form of Estimation Three step process 1) PM estimates the size in terms of SLOC or Functional Points or other other unit.(SIZE) 2) Estimate is converted into the amount of effort required in terms of number of person-months. (EFFORT) 3) Converted into a schedule in terms of number of months. (TIME)

  5. Single Line of Code (SLOC) Worked well for traditional projects. OO Project, CASE tools, re-usable components, make it hard to measure. Within one environment (same department, same Programming Language, it is still a good measurement) Function Point Based on # and complexity of inputs, outputs, queries, files and program interfaces Allen Albrecht, IBM,1979 www.ifpug.org 2 Basic Units to Measure Program Size

  6. When is the Cost Estimation Done ? • Must be after Planning. Theoretically, right after planning. • Similar to a Schedule, though, you can also do it later (after Analysis, After Design, After Coding).

  7. Languages (www.spr.com) LANGUAGE SLOC/Function Point • Assembly 320 • C 128 • Fortran/77 105 • COBOL 85 91 • ADA 83 71 • C++ 56 • ADA 95 55 • Java 55 • Visual Basic 35

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