Model united nations (MUN): Learning method to enhance critical thinking skill and communication skill for high school students

21st Century learning focuses on 4Cs , so students' targets can have basic abilities. Current learning methods are less suitable with 4Cs skills in geography subjects. In addition, students are required to have global awareness. Learning methods that are suitable for improving students' critical thinking and communication skills are using Model United Nations (MUN). This research is ADDIE development model with data collection that is student needs analysis , product validation, implementation validation, and audience validation. Data collection from 59 high school students found 60% of students needed the development of a fun learning method and 92% wanted MUN to be applied to learning. The results of the product validation gained a score of 97.58% and the results of the validation of the implementation got 95% and the results of the validation of the audience based on the critical thinking skills assessment got an average score of 82.58 and communication skills assessment got an average score of 84.45 with 31 students . Based on the results of the validation of product development is considered very appropriate without revision. Thus, Model United Nations as a learning method is able to train and measure students' critical thinking skills and communication skills