ABSTRAK: Permasalahan dalam penelitian ini adalah 1) Apakah penerapan model pembelajaran berbasis masalah (problem based learning) dapat meningkatkan efektivitas mengajar pada guru sosiologi kelas XI IPS MA Annur Azzubaidi? 2) Apakah penerapan model pembelajaran berbasis masalah (problem based learning) dapat meningkatkan aktivitas belajar sosiologi pada siswa kelas XI IPS MA Annur Azzubaidi? 3) Apakah penerapan model pembelajaran berbasis masalah (problem based learning) dapat meningkatkan hasil belajar sosiologi pada siswa kelas XI IPS MA Annur Azzubaidi?. Penelitian ini adalah Penelitian Tindakan Kelas (PTK) dengan menerapkan model pembelajaran berbasis masalah (problem based learning). Subyek penelitian ini adalah siswa kelas XI IPS MA Annur Azzubaidi Kecamatan Meluhu, Kabupaten Konawe yang berjumlah 26 orang siswa putri. Aspek yang diteliti adalah guru, siswa dan hasil belajar. Prosedur penelitian tindakan kelas terdiri dari 2 siklus pelaksanaan penelitian tindakan tiap siklus dilakukan melalui empat tahap yaitu : 1) Perencanaan, 2) Pelaksanaan Tindakan, 3) Observasi dan Evaluasi serta 4) Refleksi. Indikator keberhasilan proses tindakan yaitu : 1) Indikator efektivitas mengajar guru dikatakan tuntas apabila 90% telah melaksanakan model pembelajaran berbasis masalah (problem based learning) 2) Indikator aktivitas siswa dikatakan tuntas apabila 90% telah melaksanakan model pembelajaran berbasis masalah (problem based learning) 3) Indikator hasil belajar sosiologi dikatakan tuntas apabila 80% siswa telah tuntas dengan perolehan nilai 72 atau lebih, sesuai dengan KKM yang ditetapkan sekolah sebesar 72. Penelitian menunjukkan bahwa 1) Efektivitas mengajar guru dalam melaksanakan model pembelajaran berbasis masalah (problem based learning) yaitu pada siklus I sebesar 84,61% siklus II sebesar 100%, 2) Aktivitas belajar siswa juga meningkat dengan skor perolehan siklus I sebesar 83,33% siklus II sebesar 100% 3) Hasil belajar sosiologi siswa kelas XI IPS MA Annur Azzubaidi Kecamatan Meluhu Kabupaten Konawe dapat ditingkatkan melalui penerapan model pembelajaran berbasis masalah (problem based learning), hal ini terlihat pada siklus I nilai rata-rata siswa 79,56 dengan persentase ketuntasan 61,53% adapun pada siklus II nilai rata-rata siswa 88,12 dengan persentase ketuntasan 82,60% sehingga ketuntasan belajar siswa tercapai. Kata Kunci: Efektivitas, Aktivitas, Hasil Belajar ABSTRACT: The problems in this study are 1) Does the application of the problem based learning model can improve the effectiveness of teaching in class XI IPS MA Annur Azzubaidi sociology teachers? 2) Can the application of the problem based learning model improve sociology learning activities for students of class XI IPS MA Annur Azzubaidi? 3) Does the application of the problem based learning model can improve sociology learning outcomes in class XI IPS MA Annur Azzubaidi ?. This research is a Classroom Action Research (CAR) by applying a problem based learning model. The subjects of this study were students of class XI IPS MA Annur Azzubaidi, Meluhu District, Konawe District, totaling 26 female students. The aspects studied were teacher, student and learning outcomes. Classroom action research procedure consists of 2 cycles of action research implementation each cycle carried out through four stages, namely: 1) Planning, 2) Implementation of Actions, 3) Observation and Evaluation and 4) Reflection. Indicators of the success of the action process are: 1) Indicators of teaching effectiveness of teachers are said to be complete if 90% have implemented problem based learning models 2) Indicators of student activities are said to be complete if 90% have implemented problem based learning models (problem based learning) 3 ) Indicators of sociology learning outcomes are said to be complete if 80% of students have completed with 72 or more, in accordance with the KKM set by schools by 72. Research shows that 1) The effectiveness of teaching teachers in implementing problem-based learning models, namely on cycle I amounted to 84.61% cycle II amounted to 100%, 2) Student learning activities also increased with the acquisition score of cycle I amounted to 83.33% cycle II amounted to 100% 3) Sociology learning outcomes of students of class XI IPS MA Annur Azzubaidi District Meluhu District Konawe can be improved through the application of problem based learning models (problems based learning), this can be seen in the first cycle the average value of students 79.56 with a percentage of completeness 61.53% as for the second cycle the average value of students 88.12 with a percentage of completeness 82.60% so that students' mastery learning is achieved. Keywords: Effectiveness, Activities, Learning Outcomes