Nonconformity (quality)

In quality management, a nonconformity (also known as a defect) is a deviation from a specification, a standard, or an expectation. Nonconformities are classified as either critical, major, or minor.

In software engineering, ISO/IEC 9126 distinguishes between a defect and a nonconformity; a defect is the nonfulfilment of intended usage requirements, whereas a nonconformity is the nonfulfilment of a requirement. A similar distinction is made between validation and verification.

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