In the implementation phase, it is obtained: (1) cognitive strategy in understanding the material displayed in the student's book and cognitive strategy in problem solving which is shown in the LKS (qualitative data), and (2) the score of learning result test (quantitative data). While the implementation stage includes the application of learning tools to students of class VIII1 SMP Negeri 2 Bantimurung as a selected class. The things prepared in this preparation phase are validated, except the cognitive strategy brochure. The preparation stage includes the preparation of learning tools in the form of Learning Implementation Plan (RPP), Student Book, Teacher Book, Student Activity Sheet (LKS), Cognitive Strategy Brochure, and research instrument. This research procedure through two stages, namely through the preparation stage and implementation phase. This study aims to find out: (1) the profile of cognitive strategies of junior high school students in learning equation of straight line, both in understanding the material and in problem solving, (2) description of learning result of equation of straight line of junior high school student from the type of cognitive strategy used.
