Black Hole2
Human factor

- Bringing common sense back to software development -

  • Significant variability exists in the outputs of different individuals, for instance:
    • Design defects found by different reviewers
    • Defect “density” for designs done by different individuals
    • Bugs found by different code reviewers
    • Code defect density for different developers
    • Defect turn around time for different individuals
    • Different testers productivity (tests executed or bugs found)
    • Different testers accuracy (“good” problems found)
  • Significant invariance exists in the output of a single individual, for instance:
    • Design defects found by same reviewer
    • Defect “density” for designs done by same individual
    • Bugs found by same code reviewer
    • Code defect density for same developer
    • Defect turn around time for same individual
    • Same tester productivity (tests executed or bugs found)
    • Same tester accuracy (“good” problems found)

Why is that so and what is the consequence?

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