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2.3.1 is defined as the attributes of software that bear on the users' efforts for recognizing the logical concept and its applicability.
Understandability for Reuse is a special case of the quality criterium Understandability 2.3.1 and not specifically mentioned in the ISO 9126-3 standard. It can be understood as understandability of software for a software engineer/developer with the purpose of integrating it in new systems, e.g., understandability of libraries and components.
Hence, software engineers/developers should be able to select a software product which is suitable for their intended use. Internal understandability reuse metrics assess whether new software engineers/developers can understand: whether the software is suitable; how it can be used for particular tasks.