Marwan Setiawan, Effectiveness of the Cooperative Learning Model on Student Activities and Learning Outcomes in Citizenship Education Subjects The Main Discussion Efforts to Eradicate Corruption at SMA Negeri 15 Garut. This study aims to determine the application of the Cooperative Learning model to student learning activities on the results of Civic Education (Civics) class X IPS SMA Negeri 15 Garut. The research is based on the findings in the field that students' understanding of the concept of reflection and translation is still weak, so that many misconceptions occur in this sub-topic. One of the causes of the weak understanding of students is the lack of involvement of student activities during learning. So it is necessary to choose an appropriate learning method and can involve student activities to the maximum. One method that can form and develop self-confidence in students, so that students can understand and develop basic concepts with better ideas is the Cooperative Learning model using the Learning Together method, which is an easy way to absorb information, study together in groups. foster interactive, mutual help, and minimize the difference between high-low learning activities and learning outcomes according to the program. The hypothesis proposed is the use of the cooperative learning model can increase the effectiveness of Civic Education learning in the subject of Corruption Eradication Efforts in class X SMA Negeri 15 Garut. The research method uses the Quasi Experimental Design method, in the form of Nonequivalent Control Group Design. In this model, treatment begins, both groups are given an initial test or pretest to measure the initial condition (O1). Furthermore, the experimental group was given treatment (X), after completing the treatment both groups were given another test as a posttest (O2), while the control group after the initial test (O3) was not treated as in the experimental class, learning was carried out as usual (conventional). ), then given the test (O4). The study population was limited to class X SMA Negeri 15 Garut in the 2010- 2011 academic year from 9 classes, only 2 (two) classes were taken which were used for evaluation at different times and places in the same semester. As many as these two classes, can have characteristics that are representative (represent) as a sample of the population. In science lessons, especially Citizenship Education class X can only take one subject. Researchers, only examined the subject of Citizenship Education with the subject of Corruption Eradication Efforts. The variables considered include multiple paradigms with two dependent variables. The effectiveness of the cooperative learning model (X), student learning activities (Y1) and student learning outcomes (Y2). Analyzing the research data, used validity and reliability tests, t-test with the help of the SPSS.19 for Windows program. The results of this analysis, may be useful to add insight to teachers in improving teaching skills. Teachers need to use appropriate and effective learning models. Teachers in the field of Citizenship Education studies, should always use the Cooperative Learning learning model, because it is proven that this model can encourage the effectiveness of student learning outcomes, and has provided opportunities for students to develop themselves democratically, think critically, creatively, innovatively, excite, interesting, fun, arouse desire, selfconfidence, perseverance, enthusiasm, competitive, optimistic, persistent, active in reading and looking for learning resources independently. In this model students are no longer used as objects but students are used as subjects to study together and discuss them in solving problems according to the topics taught. The results of this study may be a recommendation to policy makers, and users and future researchers who are interested in conducting further research.