Quy tắc trong tình bạn của học sinh trung học cơ sở – The rules in the friendship of middle school students.

This study aims to identify the existence of rules in the friendships of middle school students and to compare the results with previously documented characteristics of friendship at this age. A questionnaire survey (with 1,189 students) and product analysis (with 197 written assignments) were employed to collect data. The findings indicate that students strongly affirm the presence of rules in friendships. When compared with existing theories, the study reveals similarities, differences, and new aspects in the friendships of today’s middle school students. Keywords: Adolescents, adolescent friendship, middle school, rules, rules in friendship.