This study aims to (1) determine an increase in collaboration and communication skills through project-based learning, (2) determine the relationship of collaboration skills and communication skills through project-based learning. The population of this research is six classes XI MIA and a sample of this research are two classes, an experiment class with projectbased learning and a control class with conventional. The instrument of collaboration and communication skills are the observation sheet and questionnaire. Improved collaboration and communication skills were analyzed using normalized gain (Ngain). A collaborative relationship with communication using the correlation test. N-gain results show that project-based learning can improve student's collaboration and communication skills, each in the medium category. The relationship between collaboration and communication skills shows a positive direction, which means that the more the collaboration skills increase, the better the student's communication skills.

ABSTRAK   Penelitian ini bertujuan untuk mengetahui pengaruh penerapan model problem based learning terhadap hasil belajar dan akivitas siswa. Jenis penelitian ini adalah quasi eksperiment dengan desain nonequivalent control group design dan dilakukan di SMA Negeri 1 Stabat tahun pelajaran 2014/2015. Sampel dipilih secara cluster random sampling, kelas X MIA-2 menggunakan model konvensional dan kelas X MIA-3 menggunakan model problem based learning. Hasil uji hipotesis adalah terdapat pengaruh model problem based terhadap hasil belajar fisika siswa. Hasil aktivitas siswa yang menggunakan model problem based learning termasuk kategori aktif.   Kata Kunci : model problem based learning, hasil belajar, aktivitas.