Abstract

Critical thinking skills are able to prepare students to think in various disciplines, and can be used to fulfill intellectual needs and develop the potential of students. This research is a research and development research, with the procedure of this research adapting the ADDIE development model with 5 stages of development, namely, 1). Analysis, 2). Design, 3). Development, 4). Implementation, and 5). Evaluation, The results of research on the development of teaching materials based on the results of expert assessments of teaching materials obtained an average percentage of eligibility of 86.25% with a very feasible category. Based on user responses in small group trials, the average percentage of eligibility is 85.23% and is included in the "Very Eligible" category, while the feasibility of teaching materials based on user responses in large group trials obtained a feasibility percentage of 93.54% and is also included in the very decent category. In addition, the results of the calculation of the effectiveness of teaching materials on increasing students' critical thinking skills obtained a price of tcount = 9.1756 which is greater than ttable = 2.0129 with a significance level of 5% and the value of degrees of freedom = 46, so it can be concluded that the material The desktop-based excretory system flipbook teaching that has been developed is proven to be effective in improving the critical thinking skills of class XI students at SMA Terpadu Wira Bhakti Gorontalo.