| Summary: | The study presents the design and validation of a Physical Education for Sustainable Development (PESD) instrument. This consists of a 25-item quantitative instrument that assesses the teaching interventions of physical education teachers. A total of 358 physical education teachers completed the questionnaire. The instrument uses an 8-point Likert scale. For the validation of the instrument, content validation, factorial validation, reliability through Cronbach’s alpha, and stability through test–retest were considered. The results show that the PESD is a two-factor instrument with very high reliability (0.95). In addition, positive results were found for the temporal stability of the scale. The principal component factor analysis results show that the scale consists of two factors: (1) environmental, health, and economic sustainability; and (2) social sustainability, gender, and inclusion. This questionnaire is the first valid and reliable tool to measure the ability of physical education teachers to promote attitudes that favour sustainable actions.
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