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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 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
slide10
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

slide11
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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