摘要：The study aimed to analyze the psychometric properties of the Participant Role Appoach (PRA) to measure bystander roles in bullying in Mexican children. 787 Mexican elementary school students participated, 415 (52.7 %) boys ( M age = 10.59, SD = .66 years) y 372 (47.3 %) and ( M age = 10.51, SD = .64 years). The results of the confirmatory factor analysis suggest that the three-role model (pro-harassment, pro-social and non-committed) fits better than the four-role model (encouraging, helper, defender and non-committed). The PRA presents measurement invariance in both sexes and evidence of concurrent validity. It was concluded the scale has adequate psychometric properties for the measurement of bystander roles .
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