7 Principles of Software Testing ::
Testing shows defects
Exhaustive testing is impossible
Early testing
Defect clustering
Pesticide paradox
Testing is context-dependent
Absence-of-errors fallacy


Testing shows the presence of defects: The purpose of testing is to identify and expose defects in software.

Exhaustive testing is impossible: It is impractical to test every possible combination, so testing focuses on representative cases.

Early testing: Testing should start early in the software development process to catch defects sooner and reduce rework.

Defect clustering: Defects tend to cluster in specific areas, so testing should prioritize those areas.

Pesticide paradox: Repeating the same tests can lead to diminishing returns, so test cases should be regularly reviewed and updated.

Testing is context-dependent: Testing approaches should consider the unique requirements and constraints of each software project.

Absence-of-errors fallacy: The absence of detected errors during testing does not guarantee a defect-free software system. Additional quality assurance activities are necessary.

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