<![CDATA[This research aims to improve students' ability to understand mathematical concepts through the Project Based Learning (PJBL) model assisted by the Geogebra application at XIth Class students of SMK Swasta Al-Furqon Batu Bara in 2023/2024 Academic Year. The subjects of this classroom action research are XIth class, Principal as data source subject. Data collection methods are carried out using test, observation and documentation techniques. This action research was carried out in two cycles, each cycle consisting of: planning, action, observation and reflection. The results of this research show that the use of the Project Based Learning (PJBL) model assisted by Geogebra can improve the ability to understand mathematical concepts at XIth Class students of SMK Swasta Al-Furqon Batu Bara in 2023/2024 Academic Year. It can be seen from the average value of students' mathematics learning outcomes which has increased, namely pre-cycle 58.38%, in cycle I, 70.47% and in cycle II, 81.23%. Apart from that, the percentage of students' learning completeness also increased, namely in the pre-cycle it was 14.28%, in the first cycle it was 42.85% and in the second cycle it was 80.95%.Keywords: Geogebra, Understanding Mathematical Concepts, Classroom Action Research, Project Based Learning (PJBL)]]>
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