This research aims to produce a valid learning tool development and implementation of field trials using Problem Posing using model-based character education CD-assisted learning in terms of critical thinking skills of learners SMP. This study is an R & D (research and development). Outcomes of this research is the products with the learning device consisting of a syllabus, lesson plans, CD Learning, and Student Worksheet. The results of the validation experts claim all devices developed well and can be used with an average score of 3.70 on the highest score 4. Results of field trials of mathematics learning with learning model Character Education Based Problem Posing Assisted Learning CD Seen From Critical Thinking Ability of Students of SMP the quadrilateral material class VII produce effective learning based on (1) the average value of the experimental class students achieve more than KKM is 81.79 so thoroughly in the classical experimental class. (2) the results of student learning achievement experimental class better than the control class. Values obtained 81.79 to 65.88 for the experimental class and the control class. Based on the results of a valid and effective learning mentioned above, the development of learning tools achieve the desired results.

Keywords: research and development, problem posing, character education, critical thinking