General: Frailty or shortcoming that prevents an item from being complete, desirable, effective
, or of merit, or makes it to malfunction or fail in its purpose.
Manufacturing: Non-conformance of a product
with the specified requirements
, or non-fulfillment of user
expectations (including the safety
aspects). Defects are generally classified
into four classes: (1) Class-1: very serious, directly causes severe injury
or catastrophic loss; (2) Class-2: serious, directly causes significant
injury or economic loss; (3) Class-3: major, related to significant problems with respect to intended normal or reasonable
use; and (4) Class-4: minor
, related to minor problems with intended normal or reasonable use.
Two other types of defects are latent defect
and patent defect
. See also blemish
, and non-conformity.