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Title

PSYCHOMETRIC PROPERTIES OF THE PERSIAN LANGUAGE VERSION OF THE SYSTEM USABILITY SCALE

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 Start Page 82 | End Page 90

Abstract

 Background: The SYSTEM USABILITY SCALE (SUS) is a widely used self–administered instrument for evaluating the usability of a wide range of products and services. The aims of this descriptive-methodological study were to develop and investigate the psychometric properties of the IRANian version of the SUS.Methods: The study was conducted among 202 university students from the Tabriz University of Medical Sciences, IRAN. Content VALIDITY was evaluated by a panel of 10 experts. Construct VALIDITY was assessed by exploratory and confirmatory factor analyses. The internal consistency and test-retest RELIABILITY were assessed by Cronbach’s alpha and Intraclass Correlation Coefficient (ICC), respectively. Additionally the feasibility of the measure was judged by ceiling and floor effect.Results: Content VALIDITY of the short form of IRANian SUS was established. Factor analyses supported the conceptual uni-dimensionality, and thus confirmed the construct VALIDITY of the measure. The internal consistency (a=0.79) and test retest RELIABILITY (ICC=0.96) were both approved and there was also no ceiling nor floor effect.Conclusions: The findings support the use of SUS for both practical and research settings in IRANian population.

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