Usability Definition — Iso 9241-11 2018

| Aspect | ISO 9241-11:1998 | ISO 9241-11:2018 | |--------|------------------|------------------| | Scope | Primarily office software | Products, services, physical systems | | Metrics | Effectiveness, Efficiency, Satisfaction | Same (refined definitions) | | Learnability | Implicit | Explicitly as part of efficiency over time | | Context of use | Mentioned | | | Errors | Measured separately | Subsumed under effectiveness/efficiency | | Suitability for non-work tasks | Weak | Still weak |

Metric (SUM) paper, mention in just a footnote that time-on-task should aim to be lower, with no further explanation. higher compl... Carl J. Pearson, PhD - slide "Usability - ISO 9241 definition" - W3C effectiveness: the accuracy and completeness with which specified users can achieve specified goals in particular environments. W3C What is Usability - The Ultimate Guide — updated 2026 - Page 2 | IxDF Effectiveness—It supports users in completing actions accurately. Efficiency—Users can perform tasks quickly through the easiest p... IxDF Usability attributes: an initial step toward effective user-centred ... The common attributes are: ease of learning (learnability), speed of performance (efficiency), low error rate, retention over time... University of Wollongong Research Online What is Usability - The Ultimate Guide | IxDF - Interaction-Design.org Usability encompasses three core factors: effectiveness, efficiency, and satisfaction. www.interaction-design.org 5 sites Can longer task times for users be a good thing? Jan 4, 2024 — iso 9241-11 2018 usability definition