Integrating the Social Interaction System of Dalihan Na Tolu into the Problem Based Learning on Biology Subjects to Increase Students Achievement

This research was expanded research which aimed to develop problem based learning model by social interaction system of Dalihan Na Tolu to increase the students achievement. It used approach of Plomp research design which consisted of three steps, they were the first research, prototype, and assessment. The product was the model of problem based learning of Dalihan Na Tolu system (PBL DNT) that valid, practice, and effective. The result of the research showed that the model of PBL DNT was valid which the content validity was 4, 70 and the construct validity was 4, 94. The implementation of the model of the first trial and the second one that observed by two observers was done well. The effectivity test was done by analyzing the test result of students cognitive ability in Biology. The test result of the first trials was 71 % students classically got the graduation criteria.