Iso 9241-11 Usability Definition 2018 -

1. Executive Summary ISO 9241-11:2018 (“Ergonomics of human-system interaction — Part 11: Usability: Definitions and concepts”) replaces the earlier 1998 version. It provides an updated, internationally standardized framework for defining and understanding usability in system, product, or service design. The standard shifts from a narrow “ease of use” perspective to a broader, context-dependent definition that emphasizes outcomes of use (effectiveness, efficiency, satisfaction) within specific contexts of use . 2. Official Definition of Usability (2018) Usability Extent to which a system, product or service can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use. (Source: ISO 9241-11:2018, clause 3.1.1) 3. Key Components of the Definition The 2018 definition is composed of three measurable outcome components, plus explicit recognition of the context: