<![CDATA[The research problem is the low participation and achievement of students studying physics. The purpose of this study to increase the participation and achievement of students studying physics. Subjects were students of class XI SMA Negeri 01 MIA 1 Manokwari the 1st half of the school year 2014/2015. This classroom action research conducted in two cycles, wherein each cycle includes the activities of planning, action, observation, and reflection. Troubleshooting methods used isthe application of cooperative learning Numbered Heads Together (NHT) in physics. The research instrument used learning achievement test, questionnaire sheets participation, participation observation sheet, questionnaire responses of learners, teacher observation sheet and field notes. Implementation of collaborative research involving two teachers of physics. A teacher acts as the implementing measures and a teacher again act as observers of teacher activity and the activity of learners. The results showed that in the first cycle obtained an average score of participation 3.07, and the average score of the learning achievement of classical physics 59.70 with a percentage of 20%. Cycle II with an average score of participation of 3.11, and an average score of 80.79 with a percentage of learning achievement classically 77%. This shows that there is increased participation and completeness in classical. Thus the classroom action research with the implementation of cooperative learning NHT can increase participation and achievement of students studying physics.]]>
