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2.3.3 is defined as the attributes of software that bear on the users' efforts for operation and operation control.
Operability for Reuse is a special case of the quality criterium Operability 2.3.3 and not specifically mentioned in the ISO 9126-3 standard. It can be understood as programmability of software, i.e., the development effort for a software engineer/developer to integrate it in new systems, e.g., programmability software using libraries and components.
Hence, internal programmability metrics assess whether software engineers/developers can integrate and control the software.
General operability metrics can be categorized by the dialog principles in ISO 9241-10: suitability of the software for the task; self-descriptiveness of the software; controllability of the software; conformity of the software with user expectations; error tolerance of the software; suitability of the software for individualization. This also applies to operability in a reuse context.