Tujuan penelitian ini adalah untuk meningkatkan kepercayaan diri dan komunikasi matematis mahasiswa dengan penerapan model Project-Based Learning pada mata kuliah microteaching semester VII. Jenis penelitian ini adalah Penelitian Tindakan Kelas (PTK) yang meliputi dua siklus.Instrumen penelitian yang digunakan dalam pengumpulan data meliputi perangkat pembelajaran, tes kemampuan komunikasi matematis, dan angket kepercayaan diri mahasiswa. Adapun Analisis data menggunakan analisis kualitatif deskriptif naratif dan analisis data kuantitatif statistik deskriptif. Berdasarkan hasil analisis data dapat disimpulkan sebagai berikut: 1) Proses pembelajaran mengalami perbaikan dilihat dari hasil observasi proses belajar mengajar, dan 2) Kemampuan komunikasi matematis dan kepercayaan diri mahasiswa mengalami peningkatan.The purpose of this study is to improve the students' self-confidence and mathematical communication by implementing Project-BasedLearning in the semester VII. This type of research was action research with two cycles. The research instrument consisted of learning tools and data collection instruments in the form of tests of mathematical communication skills and student self-confidence questionnaires. Data analysis used was descriptive qualitative narrative analysis and descriptive statistical quantitative data analysis. Based on the data finding, it was faound that: 1) The learning process had improved seen from the observations of the teaching and learning process, and 2) Mathematical communication skills and student confidence had increased
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