Improving Students’ Critical Thinking Skills Through Case Based Learning Oriented Textbook

The development of teaching materials is a manifestation the lecturer's efforts to develop strategy in learning that adjusts specific principles by making various adaptations theories. functions as medium will facilitate each student achieve outcomes from material be studied. This study aims valid, practical, and effective textbook Law International Relation courses using case-based framework, prove its potential impact on student's critical thinking skills. research used Hannafin Peck model which consists three phases activity: analysis, design implementation, evaluation revision process. results showed developed was valid after being reviewed instructional experts regarding feasibility content, presentation language with mean score 3.88 (valid category) for 4.28 (very design. declared practical tested at one-to-one small group stages 55.67 (practical category). field test students’ skills revealed pre-test 60.4 increased post-test 91.2 an N-gain value 0.78 (high means oriented effectively improves student’s