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What is Defect Density?

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Defect density is a type of quality metric that measures defects relative to complexity. For example, it is common for defect density to be measure defects per thousand lines of code or function points.


Defect density = (number of defects) / size

Here size can be any measure of complexity such as function points or lines of code.
Defect density should not be confused with defect rate which is the percentage of units with a defect. Generally speaking, defect rate applies to manufacturing and defect density to software development.
Overview: Defect Density
A class of metrics that measures the number of defects as a rate.
Common Metrics
Defects per 1000 lines of code
Defects per 1000 function points
Defects per story point
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Information Technology Metrics

This is the complete list of articles we have written about information technology metrics.
Capability Rate
Defect Density
IT Examples
Lines Of Code
Story Points
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