Glossary

Experimental comparison of two UI variants in live or staged environments to quantify effects (e.g., click or conversion rate).

Degree to which digital products are usable by people with disabilities; often mandated by law (e.g., WCAG/EN 301 549).

Systematic audit of the four WCAG principles (Perceivable, Operable, Understandable, Robust), incl. practical checks.

Perceived action possibility of an element (e.g., a button looks clickable)—central to intuitive interaction.

Standardized UX questionnaire using semantic differentials to measure pragmatic and hedonic quality.

Systematic distortions in planning, conduct, or analysis (e.g., moderation or sampling bias).

German ‘Barrierefreie-Informationstechnik-Verordnung’: national legal framework for digital accessibility (based on WCAG/EN 301 549).

Mental demand (intrinsic, extraneous, germane); goal: minimize extraneous load.

Expert, task-oriented evaluation focusing on first-time use and users’ cognitive steps.

Visualization of usage journeys across phases, touchpoints, goals, emotions and pain points—basis for improvements.

Seven design principles (e.g., task appropriateness, controllability, error tolerance) for user-friendly interaction.

Modular standards series on ergonomics of human–system interaction; foundation of many Usability/UX norms.

Extent to which users achieve goals completely and correctly.

Resources expended (time, clicks, mental effort) relative to goal achievement.

Differentiation of execution errors (slips) and decision errors (mistakes) to design error-tolerant systems.

Context- and experience-led expert inspection of a UI without a fixed heuristic catalog.

Experience-based guideline for rapid usability assessment (e.g., Nielsen’s 10 heuristics).

Standard that defines/measures usability via effectiveness, efficiency and satisfaction in the context of use.

Iterative, user-centered process including context analysis, requirements, design, and evaluation.

Usability that is methodically documented and aligned with ISO parts (esp. 11, 110, 210).

Internal representation of how a system works—shapes expectations, navigation, and error propensity.

Questionnaire to capture subjective workload (e.g., mental, temporal, effort).

Data-grounded user archetypes (goals, needs, frustrations) used as a design decision aid.

Usability testing conducted remotely via tools; moderated or unmoderated; with attention to setup and privacy.

Subjective experience of use (e.g., clarity, trust, low stress) as a quality dimension.

Brief standardized usability questionnaire (10 items) yielding a 0–100 score.

Share of tasks completed successfully in usability tests—indicator of effectiveness/efficiency.

Test method in which users verbalize thoughts during tasks; reveals cognitive processes.

Standardized UX questionnaire (26 items) with six dimensions incl. attractiveness and clarity.

Fitness for use: effective, efficient, satisfactory within a defined context of use.

Systematic, standards-based approach to ensure usability via methods, metrics, and iteration.

Holistic experience before, during and after interaction—includes usability but goes beyond it.

Visible and operable surface (layout, typography, icons, components) as part of UX.