The International Usability and UX Qualification Board (UXQB) distinguishes between
Definition of Qualitative User Requirements
A statement of what users must be able to locate, recognize, understand, select or input as part of performing a task with the interactive system.
Definition of Quantitative User Requirements
Required level of usability to meet identified user needs expressed in terms of effectiveness, efficiency and user satisfaction in a specified context of use.
(CPUX-UR – Curriculum (Version 1.3, June 2016))
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