Journal of Innovative Mathematics Learning ISSN 2621-4733 (print) Volume 3, No. 3, September 2020 ISSN 2621-4741 (online) 158 THE ROLE OF PROBLEM SOLVING APPROACH ON IMPROVING STUDENT'S COMMUNICATION ABILITY AND SELF EFFICACY Resnawati 1 , Utari Sumarmo 2 , Asep Kustiana 3 Mathematics Education of Post Graduate IKIP Siliwangi Bandung 1 resna.belva@gmail.com, 2 utari.sumarmo@gmail.com, 3 4sep.kustiana@gmail.com Received: August 5 th , 2020; Accepted: September 15 th , 2020 ABSTRACT This study is a pretest-posttest experiment control group design having a goal to analyze the role of in problem-solving approach (PSA) on students' mathematical communication ability (MCA) and self-efficacy in mathematics (MSE). The study involves 66 eighth grade students, and MCA test, and an MSE scale. The study revealed that PSA took a better role than SA in obtaining MCA and MSE. Students getting treatment with PSA obtained MCA and MSE were at good grade quality, while students taught by SA attained MCA and MSE were at pretty good grade level. Besides that, the study found there was a very high association between MCA and MSE. Like that, students expressed a positive opinion on PSA, even if, students still realized a few difficulties in solving MCA. Keywords: mathematical communication, self-efficacy, problem-solving approach Abstrak Penelitian ini adalah desain kelompok kontrol eksperimen pretest-posttest yang memiliki tujuan untuk menganalisis peran dalam pendekatan Problem Solving (PSA) pada kemampuan komunikasi matematika siswa (MCA) dan self-efficacy dalam matematika (MSE). Penelitian ini melibatkan 66 siswa kelas delapan, dan tes MCA, dan skala MSE. Studi ini mengungkapkan bahwa PSA mengambil peran yang lebih baik daripada SA dalam mendapatkan MCA dan MSE. Siswa yang mendapatkan pembelajaran dengan PSA yang diperoleh MCA dan MSE berada pada kualitas kelas baik, sementara siswa yang diajarkan oleh SA mencapai MCA dan MSE berada pada tingkat kelas yang cukup baik. Selain itu, penelitian ini menemukan ada hubungan yang sangat tinggi antara MCA dan MSE. Selain itu, siswa menyatakan pendapat positif tentang PSA, bahkan jika, siswa masih menyadari beberapa kesulitan dalam menyelesaikan MCA. Kata kunci: komunikasi matematis, self-efficacy, pendekatan Problem Solving How to Cite: Resnawati, R., Sumarmo, U., Kustiana, A. (2020). The Role of Problem Solving Approach on Improving Students’ Communication Ability and Self Efficacy. JIML, 3 (3), 158- 169.