Abstract
Objective: To adapt culturally the System Usability Scale to Brazilian Portuguese and assess its internal consistency and structural construct validity. Materials and methods: This methodological study of a measurement instrument’s cultural adaptation included the initial translation, the translations’ synthesis, the back-translation, the evaluation by a committee of eight experts, testinh with a sample of 100 students, who evaluated the usability of the WhatsApp application, and the evaluation of structural construct validity by exploratory factor analysis. Results: The judges validated the Brazilian version of the System Usability Scale in the second round. It was revealed that, following the structural construct validation, the version had a unidimensional structure and an acceptable level of reliability (Cronbach’s alpha of 0.76). Besides, in the usability test, no suggestions for change were made. Conclusions: It is worth noting that the Brazilian version of this scale was semantically, idiomatically, conceptually, and culturally equivalent to the original English version and showed adequate reliability and structural construct validity.
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