PENERAPAN MODEL PEMBELAJARAN BERBASIS MASALAH (PBL) UNTUK MENINGKATKAN PENGUASAAN KOSA KATA SISWA

This reseacrh aims at improving students' vocabulary mastery by implementing Problem-Based Learning (PBL) Model. The sample was 17 students of grade XI at SMA Utama Widya Pasraman Wira Dharma Palu, academic year 2022/2023. The research applied Classroom Action Research design implemented in spiral model which covered planning, action, observation and reflection. The research was conducted in two cycles. Each cycle consists of four meetings including test. Some instruments that used to collect the data were test, observation checklist and field notes. the result of data analysis indicated that percentage of students passed score above KKM which is 70 in cycle 1 was 47.06 percent or 8 students. In cycle 2, the result test increased to 83.25 percent of 14 students. It caused of the revised plan in cycle 2. Thus, Problem-Based Learning (PBL) is effective to improve students' vocabulary mastery of grade XI students at SMA Utama Widya Pasraman Wira Dharma Palu.

Keyterms: Improve, Vocabulary Mastery, Problem-Based Learning (PBL) Model