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Bug vs Defect

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A bug is a flaw in the design or implementation of something.
A defect is a non-conformance to requirements.

The Difference

A bug is a design or implementation mistake. Finding a bug generally requires an understanding of how something is implemented. For example, developers may find bugs in code and engineers may find bugs in hardware.
A defect is when something doesn't meet requirements. Defects can be discovered by using a product or using testing systems to simulate a variety of conditions.


A single bug can cause a large number of defects. For example, a design flaw in a train's electrical system may cause problems with its doors and its braking control systems.
Alternatively, a bug may be difficult to detect as a defect but may have significant impact nonetheless. For example, a bug that causes a major system in an aircraft to fail under particular flight conditions may be both serious and difficult to detect as a defect.
Bug vs Defect
A flaw in design or implementation.
A non-conformance to requirements.

Reliability Engineering

This is the complete list of articles we have written about reliability engineering.
Cold Standby
Defensive Design
Design Debt
Design Life
Error Tolerance
Fault Tolerance
Graceful Degradation
Latent Error
Material Strength
Mistake Proofing
Wear And Tear
More ...
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