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Learning physics in senior high school by using a teacher-centered teaching habit must be changed. It has to empower the investigated-based collaboration. This quasi experimental study aims to analyze the effect of group investigation (GI) model compared to direct instruction (DI) model on critical thinking skills, social and spiritual attitudes, and students character. This experimental study employed a posttest only control group design. The population was 15 classes or 488 students of class X MIPA from three SMAs in Klungkung regency. The research sample was chosen by random assignment technique, and 2 classes were determined in each school, so there were 6 classes (194 students, or 39.8% of the population), 3 classes using GI and 3 other classes using DI. The study was conducted for 5 weeks each 3 hours on energy and momentum learning material. Critical thinking skills were collected by using 15 essay test items. Students social and spiritual attitudes and their character were collected by using questionnaire, every 30 items, 30 items, and 18 item respectively. Data were analyzed by one way MANOVA. The results show that GI model was better than DI model for achieving students critical thinking, social attitudes, spiritual attitudes, and their character in learning physics in the senior high schools. Keywords— Collaborative investigation, critical thinking, social attitudes, spiritual attitudes, character

The Power of Group Investigation Model on Student Critical Thinking, Attitude, and Character in Learning Physics