Development of Problem-based Learning Tools to Improve Critical Thinking Skills and Collaboration Skills of Class VIII Junior School Students

This research uses an R&D approach by applying the ADDIE Model which consists of five main stages: Analysis, Design, Development, Implementation and Evaluation. The aim of the research is to evaluate the validity, practicality and effectiveness of problem based learning tools to improve students' critical thinking and collaboration skills at SMPN 7 Menui Satap. Data collection methods include observation, critical thinking skills tests, and questionnaires to measure collaboration skills. Research instruments include tests, assessment sheets, rubrics, as well as validation sheets for PBL-based lesson plans and LKPD. The results of data analysis show that the learning tool is effective in improving critical thinking skills with an effect size value of 0.95, which indicates a very large effect from the use of LKPD on student learning outcomes and collaboration which has increased significantly at each meeting with high validity (86 .43%) and a good level of practicality (95.00% by teachers, 90.97% by students). In conclusion, this learning tool has a significant positive impact on students' critical thinking and collaboration skills.