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      On the dimensionality of the System Usability Scale: a test of alternative measurement models.

      Cognitive Processing
      Female, Humans, Learning, Male, Models, Theoretical, Questionnaires, User-Computer Interface, Young Adult

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          Abstract

          The System Usability Scale (SUS), developed by Brooke (Usability evaluation in industry, Taylor & Francis, London, pp 189-194, 1996), had a great success among usability practitioners since it is a quick and easy to use measure for collecting users' usability evaluation of a system. Recently, Lewis and Sauro (Proceedings of the human computer interaction international conference (HCII 2009), San Diego CA, USA, 2009) have proposed a two-factor structure-Usability (8 items) and Learnability (2 items)-suggesting that practitioners might take advantage of these new factors to extract additional information from SUS data. In order to verify the dimensionality in the SUS' two-component structure, we estimated the parameters and tested with a structural equation model the SUS structure on a sample of 196 university users. Our data indicated that both the unidimensional model and the two-factor model with uncorrelated factors proposed by Lewis and Sauro (Proceedings of the human computer interaction international conference (HCII 2009), San Diego CA, USA, 2009) had a not satisfactory fit to the data. We thus released the hypothesis that Usability and Learnability are independent components of SUS ratings and tested a less restrictive model with correlated factors. This model not only yielded a good fit to the data, but it was also significantly more appropriate to represent the structure of SUS ratings.

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          Author and article information

          Journal
          19565283
          10.1007/s10339-009-0268-9

          Chemistry
          Female,Humans,Learning,Male,Models, Theoretical,Questionnaires,User-Computer Interface,Young Adult
          Chemistry
          Female, Humans, Learning, Male, Models, Theoretical, Questionnaires, User-Computer Interface, Young Adult

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