SUMMARY iii Mutia Ananda. The Influence of Peer Groups on the Formation of Responsibility Character in Grade XI Students of SMA Negeri 1 Sentajo Raya. Study Program of Pancasila and Civic Education, Faculty of Teacher Training and Education, University of Riau. Advisors: (1) Jumili Arianto, S.Pd., M.H., (2) Supentri, S.Pd., M.Pd. This research was conducted due to the background of low stude…