UX EVALUATION METHODS

Positive and Negative Affect Scale (PANAS)

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Summary

The Positive Affect Negative Affect Schedule (PANAS) is a psychometric scale developed to measure the largely independent constructs of positive and negative affect both as states and traits. Positive and negative affect have been shown to relate to other personality states and traits, such as anxiety. PANAS was originally developed for more clinical settings, but is also used now in evaluation studies in which moods of users might be affected (e.g. studies around effects of lighting, of entertainment content, etc).

Strengths

+ validated instrument; used in many studies, many publications

Weaknesses

– same drawbacks as with all subjective scales – originally used for a different setting (clinical setting)

References describing the method

general introduction: http://en.wikipedia.org/wiki/Positive_Affect_Negative_Affect_Scale; manual: http://www.psychology.uiowa.edu/Faculty/Clark/PANAS-X.pdf
many other publications exist