Abstract
Has been done research which aims to implementation of lesson study in Madrasah Tsanawiyah Negeri (MTsN) 2 Mataram. This activity involved 6 graduate students as a model teacher for 3 months. Each student has the opportunity to practice as a model teacher twice and 10 times as an observer. The documents analyzed consisted of lesson plan, observation sheets, and exposure to observational data shown that (1) students have been good enough in implementation of learning based on lesson study; (2) student's abilities on making a lesson plan have improved; (3) students explained the subject material systematically; and (4) graduate student need to interpret the principle of collaboration in lesson study better, which is collaboration is not only related to completing collaborative learning activities but also value the concept of mutual learning (no one left behind). Based on this research, the use of lesson study can improve the professionalism of teachers in the management classroom and the greater teachers of collaboration in the lesson plan and finding creative solutions in teaching problems.