This research was Analysis Design Development Implementation Evaluation (ADDIE) development model with data collection that is student need 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 the product development is considered very appropriate without revision. Model United Nations as a learning method is able to train and measure students' critical thinking skills and communication skills.