Adolescent's sexual changes without being accompanied by the proper arrangements can make young people caught in risky sexual behavior which affects their future. Various challenges in giving sex instruction encourage the realization of comprehensive school-based sexuality education that's compelling in avoiding risky sexual behavior in adolescents. The objectives of this study are (1) Development of comprehensive school-based sex education using the ADDIE model. (2) Validation of a comprehensive school-based sex education module. The research method is research and development using the ADDIE model. A questionnaire served as the instrument. Data were analyzed descriptively qualitatively and descriptively quantitatively. The results showed that (1) the module design and development process followed five steps of the ADDIE model as follows: Analysis, Design, Development, Implementation, and Evaluation. (2) Based on the content expert validation, the module was suitable for use with improvements. There were some comments given by experts about the module. The average of student's questionnaires fell into the good category.
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