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A defect is a shortcoming, imperfection, failure, flaw, or fault that has or could adversely affect the operation of an item of equipment, measure or system.

Australian Standard AS 1851 introduced the terms non-conformance, non-critical defect and critical defect in the 2012 edition of the Standard. The definition was accompanied by a flowchart (Figure 1.5.6 - Routine Service Activity Failure) to illustrate the difference between each of these terms.

AS1851 2012 Critical Defect Non Conformance Flowchart - Table 1.5.6 Routine Service Activity Failure


In preparing this definition, we have drawn from various sources including Legislation, Codes, Standards and industry information, research and knowledge.  Like the english language, these definitions may subtly change from time to time. As such these definitions are provided solely on the basis that users will be responsible for making their own assessment of the definition and and are advised to verify all relevant representations, statements and information.