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Usability 2.3 is defined to be the characteristic that allows to draw conclusions about how well software can be understood, learned, used and liked by the developer.

Re-Usability is a special case of the quality factor Usability 2.3 and not specifically mentioned in the ISO 9126-3 standard. It can be understood as usability of software for integration in other systems, e.g., usability of libraries and components. Here the user is a software engineer/developer.

Hence, internal usability metrics are used for predicting the extend of which the software in question can be understood, learned, operated, is attractive and compliant with usability regulations and guidelines where here using means integrating it in a larger software system.


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