ABSTRACT THE DEVELOPMENT OF BIOLOGICAL LEARNING DEVICE BY DISCUSSION MODEL FOR MA/SMA STUDENTS ECOSYSTEM STUDY MATERIALS By : Muhammad Na’im Hadi Efforts to improve student achievement of learning biology through the development strategy pembelajaranan with Model Discussion Think-Pair - Share, with four D modeling guidelines . The resulting learning device comprising: Lesson Plan ( RPP), Students Activity Sheet ( LKPD), Test Learning Outcomes ( THB), and Student Teaching Materials ( MAS). The objectives of this study were: 1 . Developing a learning device , 2 . Describe : activities and student responses , adherence to lesson plans , students' mastery learning and obstacles encountered during the teaching and learning activities with learning models discussion of Think - Pair-share. The study design in the classroom using a one-group pretest - posttest design . The subjects were students of class X MAN Surabaya 2n...