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This study research was aimed at finding the validity, practicality and effectiveness of Problem based learning model assisted by Geogebra and describing the improvement of students' mathematical critical thinking skills. The learning devices developed are the Lesson Implementation Plan, teacher's book, student's book, Student Worksheet and student's mathematical critical thinking ability test instrument. This research is a Research and Development, using the Thiagarajan, Semmel and Semmel development models, the 4-D model. Learning devices had fulfilled the valid criteria’s according to experts, and tested in class XI at MAN Labuhanbatu. The results of research had shown that the learning device of problem based learning model assisted by Geogebra had fulfilled the practical criteria's and effective and could improve students' mathematical critical thinking skills.

Development of Learning Device through Problem Based Learning Model Assisted by Geogebra to Improve Students’ Critical Mathematical Thinking Ability