Abstract: | Recent international attention from the media and professional organizations has focused increasingly on violent incidents in sport. The present study developed and used the Sport Behavior Inventory (SBI) to examine personal and participatory variables that influence the socialization of the perceived legitimacy of aggressive sport behavior in children and adolescents ages 8–19 enrolled in public schools. In phase I of this study, the psychometric properties of the SBI as a measure of perceived legitimacy were evaluated in terms of content validity, structural validity, internal consistency, convergent validity, and discriminant validity. A multiple regression analysis in phase II indicated that increases in athletes’ perceptions of the legitimacy of aggressive sport behavior were positively related to age, being male, and contact sport participation. Results were discussed in relation to the social factors that contribute to the development of perceptions of legitimacy for aggressive sport behavior, and future research uses for the SBI. Aggr. Behav. 27:405–418, 2001. © 2001 Wiley‐Liss, Inc. |