Asian Journal of Education and Social Studies

This study aims to describe the validity of learning tools, describe the practicality of learning tools, and determine the effectiveness of Problem Based Learning-based learning tools to improve students' critical thinking skills and learning achievement. This research was conducted in class VIII of SMP Negeri 1 Telaga, Gorontalo Regency. This development research uses the ADDIE development research model. The resulting products are Teaching Modules, Learner Worksheets, and Learning Outcomes Tests. Data collection was carried out using validation sheets, learning implementation sheets, student activity sheets, critical thinking tests and student response questionnaires. The data obtained was analyzed by calculating the percentage of each acquisition score. The results showed that linguist validation received an average score of 94, IT and design expert validation received an average score of 93. The average score for the teaching module is 90 very valid, for the Learner Worksheet the average score is 95, and for the learning outcomes test the average score is 95. The overall validation results are in the very valid category. The implementation of learning shows very good results with an average of 92.8%, student activity in learning shows very good results with an average of 94.7%, and the percentage of student responses is a very good category. The results of the critical thinking test showed that the indicators of simple explanation, and basic abilities experienced the highest increase, and the lowest was the conclusion indicator. Learning achievement of students measured through learning outcomes also increased with N-Gain values in the medium and high categories. The results of this study indicate that Problem Based Learning-based learning tools can improve students' critical thinking skills and learning achievement.