Abstract:
The purposes of this study were: 1) to study social environment of students in adolescence 2) to study achieved developmental tasks of students in adolescence 3) to study social behavior of students in adolescence 4) to compare developmentaj tasks of students of different social environments 5) to compare social behavior of students in adolescence who achieved developmental tasks at different levels and 6) to study relationships between achieved developmental tasks and social behavior of adolescence.The subjects consisted of '149 Mathayorn Suksa 6 students, who enrolled in the second semester, academic year 1999, of La Salle and Sirirattanathorn schools. Data were gathered by means of questionaires which were divided into 3 parts:social environment, achieved developmental tasks and social behavior. The analysis techniques used in this study were : percentage, mean, standard deviation, t-test and Pearson Product Moment correlation coefficient.The findings were as follows: 1) students in adolescence experienced high level of support environment from their families and middle level of support environment from their schools. 2) students in adolescence achieved high level of developmental tasks. 3) students in adolescence exhibited middle level of social behavior. 4) there were highly significantly differences (p <0.001) in achieved developmental tasks between students who experienced different levels of social environment. 5) there were highly significantly differences (p < 0.001) in social behavior between students who achieved different levels of developmental tasks and 6) there was a positive relationship (r = 0.5850) between achieved developmental tasks and social behavior of students in adolescence.