Phase 3: Collaboratively Reflection or Post-discussion (see), the collaboration in discussion was performed after teaching practice in order to consider the findings after observing the learning management for improving the lesson planning, and teaching in next year. This session, was performed every week. The reflections were ranked in order by allowing the teacher reflect one’s own teaching for the first person. Then, the class-room observation team discussed the existing approach in teaching sequence through the Open Approach, gestures, and Mathematics Communication occurring in classroom.