Cocomo ii and software economics
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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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Cocomo ii and software economics

Cocomo II and Software Economics


Cocomo ii formulas

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


Process exponent p

Process Exponent (p)

Combination of 5 parameters

precedence

development flexibility

architecture risk

team cohesion

process maturity (CMM model)


7 factors

7 factors

  • Product Complexity

  • Required reuse

  • Platform difficulty

  • Personnel experience

  • Personnel capability

  • Facilities

  • Schedule


Attributes cocomo

Attributes = COCOMO

  • PRODUCT Attributes

    Required software reliability (RELY)

    Database size (DATA)

    Product complexity (CPLX)

  • Computer attributes

    Execution time constraint (TIME)

    Main storage constraint (STOR)


Attributes cocomo1

Attributes = COCOMO

  • Personnel attributes

    Analyst capabilities (ACAP)

    Applications experience (AEXP)

    Programmer capabilities (PCAP)

    Project attributes

    Required development schedule (SCED)

    Use of software tools (TOOL)


New attributes

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)


Ada cocomo

ADA - COCOMO

  • Developed after COCOMO (prior to COCOMO II)

  • For government projects (defense)

    Emphasis on Security, Reliability


Software economics

Software Economics

  • Boehm introduced top 10 software metrics


Cocomo ii and software economics

  • 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


Cocomo ii and software economics

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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