Development of set textbook with STEM-CBL nuanced integrated learning video for students' critical thinking ability.

The ability to think critically is one of the skills that are needed in the era of the Industrial Revolution 4.0. Furthermore, it is necessary to prepare a more innovative learning system so that it can produce competent graduates who have 21st-century skills, which is the ability to think critically. Based on the facts, students' critical thinking skills are still low, so they must be improved. Efforts that can be made to improve student's critical thinking skills are to pay attention to the way students are taught. This study aimed to examine the development of sets of textbooks with STEM-CBL nuances integrated with video learning on students' critical thinking skills. This research uses development research (R&D) methods with modified 4D development models, namely define, design, and develop. Data collection techniques were carried out using a questionnaire. Data analysis technique used descriptive qualitative and quantitative analysis techniques. The results showed that this textbook obtained an average final score on feasibility of 86.17% from expert lecturers and 91.67% from practitioners, indicating that the representation of teaching materials was very feasible. The results of the readability assessment by class VIII students obtained an average final score of 89.25%, indicating that the represented textbooks were easy to understand and student responses obtained an average final score of 95.5% indicating that the represented textbooks received a very good response. Thus, this product is declared as a textbook that is very feasible to be implemented in the classroom. It is necessary to conduct an effectiveness test to determine the success of using textbooks on students' critical thinking skills. [ABSTRACT FROM AUTHOR]