Definition(s):
“degree of effectiveness and efficiency with which it is possible to assess the impact on a product or system of an intended change to one or more of its parts, or to diagnose a product for deficiencies or causes of failures, or to identify parts to be modified.“
“NOTE Implementation can include providing mechanisms for the product or system to analyse its own faults and provide reports prior to a failure or other event.“
(ISO/IEC/IEEE, 25010)