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This study aims to develop a teaching book based on context to improve students' critical thinking skills on environmental pollution materials. The research method used in this study was Research and Development (R & D) with ADDIE design (Analysis, Design, Development, Implementation, and Evaluation). The instruments used in this study consisted of expert validation sheets which were used to validate teaching materials by experts, questions about readability of teaching books, questionnaires to determine students' and teachers' responses to teaching book, and instruments of critical thinking skills. The results showed that teaching books had a good level of validation in aspects of content, presentation, and language, students' responses to teaching books were very good, the teaching book assisted teachers in the learning process, and improve students 'critical thinking skills on environmental pollutions after using teaching book with N-gain of 0.33 (moderate). This indicates that context-based teaching book is useful for developing students' critical thinking skills on environmental pollution material. Keywords—context-based teaching book; critical thinking skills; environmental pollution

Development of Context-Based Teaching Book on Environmental Pollution Materials to Improve Critical Thinking Skills