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Maintainability

Analysability:
Attributes of software that bear on the effort needed for diagnosis of deficiencies or causes of failures, or for identification of parts to be modified. (ISO 9126: 1991, A.2.5.1)

Changeability:
Attributes of software that bear on the effort needed for modification, fault removal or for environmental change. (ISO 9126: 1991, A.2.5.2)

Stability:
Attributes of software that bear on the risk of unexpected effect of modifications. (ISO 9126: 1991, A.2.5.3)

Testability:
Attributes of software that bear on the effort needed for validating the modified software. (ISO 9126: 1991, A.2.5.4)



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