This three-part study aimed to translate, cross-culturally adapt, and validate the Collective Efficacy Questionnaire for Sports (CEQS) for Brazilian athletes. In Study 1, six translators and six specialists developed a Portuguese version of the CEQS (the CEQS-B), and 10 experts and 10 sports participants provided content validity evidence based on test content. In Study 2, 553 athletes completed the CEQS-B, and we provided evidence of construct and convergent validity for the test's internal structure through factor analysis and of reliability evidence based on the instrument's internal consistency and temporal stability. In Study 3, 79 athletes completed both the new CEQS-B and the Group Cohesion Questionnaire, and we provided evidence of concurrent validity for the CEQS-B, based on its relationship to other variables, with specific strong correlations between team task cohesion and collective efficacy among these participants. Overall, the results of this study support the use of the CEQS-B by researchers and professionals wishing to assess various sport athletes' self-perceived collective efficacy.
Keywords: confirmatory factor analysis; group cohesion; psychological competencies; shared beliefs; team athletes; team confidence.