The purpose of this research is to study the interaction patterns in peer groupings and their effect on the growth of student s physics concepts in the SLTP. the design of this quasi-experimentation was a hybrid model. Four classes of first grade junior high school students have been selected purposively as the sample of this study. each class was treated with a peer tutorial cooperative collaborative or random grouping respectively. The study shows that the cooperative pattern is the best pattern to foster togetherness in a group. The growth of physics concepts of students grouped in a cooperative pattern is highest than that of students grouped in other peer pattern.