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Cocomo II and Software Economics

Cocomo II and Software Economics. COCOMO II formulas. Effort = 2.45 E arch (Size) p E arch = 7 adjustment factors Size = Functional Points recommended Effort = 2.45 E app (Size) p E app = 17 adjustment adjustment factors Size = SLOC or functional points are recommended

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Cocomo II and Software Economics

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  1. Cocomo II and Software Economics

  2. COCOMO II formulas • Effort = 2.45 Earch (Size) p Earch = 7 adjustment factors Size = Functional Points recommended • Effort = 2.45 Eapp (Size) p Eapp = 17 adjustment adjustment factors Size = SLOC or functional points are recommended p = Process Exponent

  3. Process Exponent (p) Combination of 5 parameters precedence development flexibility architecture risk team cohesion process maturity (CMM model)

  4. 7 factors • Product Complexity • Required reuse • Platform difficulty • Personnel experience • Personnel capability • Facilities • Schedule

  5. Attributes = COCOMO • PRODUCT Attributes Required software reliability (RELY) Database size (DATA) Product complexity (CPLX) • Computer attributes Execution time constraint (TIME) Main storage constraint (STOR)

  6. Attributes = COCOMO • Personnel attributes Analyst capabilities (ACAP) Applications experience (AEXP) Programmer capabilities (PCAP) Project attributes Required development schedule (SCED) Use of software tools (TOOL)

  7. New Attributes • RUSE Required Reuse • DOCU Documentation • PVOL Platform Volatility (instead of VIRT) • PEXP Platform Experience • LTEX Language/Tool experience (expanded) • SITE Multi-site development (team communication)

  8. ADA - COCOMO • Developed after COCOMO (prior to COCOMO II) • For government projects (defense) Emphasis on Security, Reliability

  9. Software Economics • Boehm introduced top 10 software metrics

  10. 1) Error after delivery >100 * expensive • 2) Compress schedule a max of 25% • 3) Maintenance > Development • 4) Software Development & Maintenance costs are primarily a function of SLOC 5) Variation among people is biggest productivity difference

  11. 6) Ratio of Software to Hardware 1955 (15:85), 1985 (85:15) 7) Shift from programming (< 20% of time) 8) Integrated Systems cost exponentially more than programs 9) Walkthroughs catch 60% (arguable) 10) 80% of contribution comes from 20% of the contributors.

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