Facts about Software Engineering

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Following are some facts that can help you gain a better insight into the realities of Software Engineering.
  • The best programmers are up to 28 times better than the worst programmers.
  • New tools/techniques cause an initial LOSS of productivity/quality.
  • The answer to a feasibility study is almost always “yes”.
  • A May 2002 report prepared for the National Institute of Standards and Technologies (NIST)(1) estimates
  • the annual cost of software defects in the United States as $59.5 billion.

  • Reusable components are three times as hard to build.

  • For every 25% increase in problem complexity, there is a 100% increase in solution complexity.

    • 80% of software work is intellectual. A fair amount of it is creative. Little of it is clerical.
  • Requirements errors are the most expensive to fix during production.
  • Missing requirements are the hardest requirement errors to correct.
  • Error-removal is the most time-consuming phase of the life cycle.
  • Software is usually tested at best at the 55-60% (branch) coverage level. 100% coverage is still far from enough.
Rigorous inspections can remove up to 90% of errors before the first test case is run.
Maintenance typically consumes 40-80% of software costs. It is probably the most important life cycle phase of software.
Enhancements represent roughly 60% of maintenance costs.
There is no single best approach to software error removal.

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