Validation of the Likert scale to evaluate with experts the usability of an educational platform (SmartUsability: Usability and inclusion in educational platforms) English & Spanish questionnaire

Expert validation questionnaire used to assess the content validity of the SmartUsability Likert-scale instrument for evaluating usability, inclusion, accessibility, and AI integration in educational platforms. The questionnaire was designed for expert judgment following relevance, clarity, coherence, and sufficiency criteria.