The industrial revolution brought new challenges, opportunities and directions to the world of education. Students' critical thinking skills are urgently in line with the demands for increasingly complex problems with cross-disciplinary knowledge. Textbooks that are compatible with the development of material substance, curriculum, and student learning needs are essential. The development of textbooks cuts the barriers to learning and enhances the development of experience, and the continuous renewal of the substance of the course. This study aims to develop an electronic Pancasila and Citizenship Education Instructional Design electronic textbook based on a case study to improve students' critical thinking skills. The research adopted 10 (ten) stages of Borg & Gall's research and development model. This article presents the research and development results up to the operational product revision stage. The article specifically describes the feasibility of the book's material, language, and media aspects developed based on the assessment of competent expert validators in their field. Based on the validation results from the material, language and media experts, it shows that the case study-based electronic Pancasila and Citizenship Education Instructional Design to improve students' critical thinking skills is feasible to use in the field or the lecture process.