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Usability

Understandability:
Attributes of software that bear on the users' effort for recognizing the logical concept and its applicability. (ISO 9126: 1991, A.2.3.1)

Learnability:
Attributes of software that bear on the users' effort for learning its application (for example, operation control, input, output). (ISO 9126: 1991, A.2.3.2)

Operability:
Attributes of software that bear on the users' effort for operation and operation control. (ISO 9126: 1991, A.2.3.3)



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