Effect of Implementation Lesson Study to Improve Students’ Learning Achievement in Calculus I of Mathematics Department
This study specifically aims: 1) To determine the success of learning application lesson study with cooperative model in Calculus I subject in the Department of Mathematics, 2) To  determine students’ learning activity during the learning process that is usable by teachers in implementing the learning. The method used in this study using Classroom Action Research (CAR) and adapted to the conditions of the development of the research conducted in the Department. Study pattern through the stages of planning, implementation, observations and follow-up. The research was conducted at the Department of Mathematics UNIMA  for the  first semester students  2011/2012 academic year with the number 28 special on Mathematics Education Program in class B. Results were obtained: 1). Student learning achievement implement a lesson study with cooperative learning model to improve learning achievement of students to achieve mastery of 85.71% for the material relations and functions, while for the material derivative reaches 82.14%, on the Calculus I subject in the Department of Mathematics UNIMA, 2 ). Models of cooperative learning in study Calculus I with the pattern of lesson study allows the exchange of learning between faculty and students and between students and students and between faculty and lecturers. Keywords: Application of Lesson Study, student learning achievement,  Calculus I.