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''Learning to operate the Volume Control would be easy for me''.
Users are asked to rate these statements on a seven point [[Likert Scale]]. The average rating on these six statements is regarded as the user’s usability rating of the interaction component. Based on lab studies with difficult to use interaction components and easy to use interaction components, a break-even point of 5.29 on seven point Likert scale has been determined<ref name="Brinkman2009"/>. Using a One-sample [[student's t-test]] it is possible to examine whether users’ rating of an interaction component deviates from this break-even point. Interaction components that receive rating below this break-even point can be regarded as more comparable to the set of difficult to use interaction components, whereas ratings above this break-even point would be more comparable to the set if easy to use interaction components.
If engineers like to evaluate multiple interaction components simultaneously, the CBUQ questionnaire exists of separate sections, one for each interaction component, each with their own 6 PEOU statements.
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