In this study were examined associations among physical education instructors' argumentativeness and socio-communicative styles perceived by students and students' reasons for discipline. The sample consisted of 252 students (111 males, 141 females) aged 10 -12 years old (M = 11.4, SD = 0.79) from primary schools of public primary schools who completed three types of questionnaires during physical education classes. The results supported the internal consistency of the instruments. According to the results of the study, statistically significant differences were observed in perceived instructors' argumentativeness and assertiveness between the two classes of the students. Correlational analysis indicated that perceived instructors' argumentativeness was positively related to responsiveness, intrinsic reasons, self-responsibility reasons and caring reasons for discipline. Significant negative correlations were noted for instructors' argumentativeness with assertiveness, external reasons, introjected reasons and no reasons for discipline. The results of regression analysis revealed that perceived instructors' argumentativeness could significantly predict the variables of responsiveness, assertiveness, external reasons, introjected reasons, intrinsic reasons and self-responsibility reasons for discipline.