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The purpose of this research is: to know the students' learning outcome and the effect of cooperative learning model group investigation type toward students' learning outcome on vibration and wave subject grade viii SMP Negeri 1 Lubuk Pakam Academic Year 2013/2014. The research method was quasi experiment. The population was all students at class VIII SMP N 1 Lubuk Pakam semester II consist of 8 classes. This research sample use two classes consist of 38 students, class VIII-A as experimentaldoi:10.24114/inpafi.v4i1.5423 fatcat:vh55j4ismjevbpa6bb3qw4u5ui