Pengembangan Model Pembelajaran Matematika Materi Segiempat Berbasis Teori Van Hiele

: This research aims at developing the appropriate learning model on quadrilateral planar material for the 7th Grade students of SMPN 17 Pontianak. The methods used in this study were researching and developing. Based on the analysis on the learning process in relation to the students' thinking process and the interview, it was shown that the thinking process of the upper group of students was on the level of informal deduction. As for the middle and lower groups of students, the level was on analysis. The posttest revealed that 63.2% of students passed the material. The students experienced the activities in accordance with their ways of thinking during the learning process. In conclusion, the learning model developed for the 7th Grade students of SMPN 17 Pontianak is already appropriate