Evidence Record

Evidence summary

ISO 9241-11 defines usability as an outcome of specified users achieving specified goals with effectiveness, efficiency, and satisfaction in a specified context of use.

Exact claim supported or contradicted

Supports using task success, effort/time, and satisfaction as complementary measures for a bounded communication intervention.

Source provenance

Published international standard, edition 2, confirmed under ISO's review lifecycle. The public abstract and terminology page were inspected.

Relevant excerpt or data

The standard's definition binds users, goals, outcomes, and context rather than treating usability as a fixed artifact attribute.

Interpretation

A procedural-documentation slice can be evaluated with observable, falsifiable outcomes and can separate effectiveness from efficiency and preference.

Limitations

The full standard is paywalled; this record relies on ISO's official abstract and public terminology. The standard defines concepts but does not prescribe a specific study method.

Counterevidence

Communication can also seek trust, deliberation, learning, identity, or long-term attitude change; task measures do not exhaust those purposes.

Reproduction or verification notes

Inspect the official ISO record and public Online Browsing Platform definition for ISO 9241-11:2018.