Combined Error and Prompt Severity Rating System for Usability Testing

Error severity ranking criteria•

Level a: Prevents Task Completion

Level b: Creates significant delay and frustration

Level c: Problems have a minor effect on usability

Level d: Subtle and possible enhancements/suggestions

Prompt severity ranking criteria••

Level z: Prompt to complete full task

Level y: Prompt to proceed to next step

Level x: Prompt to understand ui

Level v: Prompt to understand proposition

• ( Dumas and Redish, 1999)

•• ( Knight, 2017

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