Development of competencies for teaching geometry through an analysis learning obstacle

Teaching and learning process that is carried out often results in learning obstacles. Based on the facts teachers rarely learn the thinking behind students’ learning obstacles. Through the analysis process of learning obstacles, is expected to develop the competency of a pre-service mathematics teacher to teach geometry. The design used in this study is a qualitative research design. This study uses the methodological framework of the Didactical Design Research (DDR). DDR or didactic design research that developed uses the philosophical foundation of hermeneutics, phenomenology, and ethnomethodology. The procedure of research through the examination of pre-service mathematics teachers in the implementation of Program Pengenalan Lapangan (PPL). Participants in the course are pre-service teachers who practice in their classrooms with various activities, such as geometric analysis and construction, presentation and resolution of geometrical problems, and the development of teaching units for geometry. Each of these activities allows learning obstacles to occur. The task of the pre-service teacher is to be able to analyze the learning obstacles faced by students. With the learning obstacle analysis process, it is the beginning of a pre-service mathematics teacher compiling in-depth knowledge related to the geometry concepts being studied.