Thursday, 25 July 2013

Defect Density

DEFINITION
Defect Density is the number of confirmed defects detected in software/component during a defined period of development/operation divided by the size of the software/component.
ELABORATION
The ‘defects’ are:
  • confirmed and agreed upon (not just reported).
  • Dropped defects are not counted.
The period might be for one of the following:
  • for a duration (say, the first month, the quarter, or the year).
  • for each phase of the software life cycle.
  • for the whole of the software life cycle.
The size is measured in one of the following:
  • Function Points (FP)
  • Source Lines of Code
DEFECT DENSITY FORMULA
USES

  • For comparing the relative number of defects in various software components so that high-risk components can be identified and resources focused towards them.
  • For comparing software/products so that quality of each software/product can be quantified and resources focused towards those with low quality.

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