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This research aims to determine the effect of outdoor study-based problem-based learning on high school students' critical thinking abilities on respiratory system material. This research methodology uses quantitative methods with a quasi-experimental type. The research population was class XI high school students with a sample size of 86 students. Data collection techniques were carried out by observation and written tests. Data analysis techniques use descriptive statistics and inferential statistics. The results of the research show that the average critical thinking ability of students in the experimental class taught using the outdoor study-based Problem Based Learning learning model is in the high category and the average critical thinking ability of students in the control class taught using the conventional learning model is low, this is based on the average posttest score from the experimental class, namely 80.22 and the control class, namely 55.95. The results of hypothesis testing using Independent Sample t-test statistics show that there is an influence of the outdoor study-based problem based learning model on the results of students' critical thinking abilities in the material on the human respiratory system Class XI Science SMA Brigjen Katamso 2 Medan.

Learning activities outside the classroom (Outdoor Study) and outside reading book texts will create a different atmosphere and understanding. One of the ways to study outdoors is to visit museums, the museum informs the public, especially students and teachers, about history classes. Museums are the best place to find historical sources, feel more grateful, get to know the world more broadly. The purpose of this community service writing is to disseminate information about the existence of the OSF Semarang Mission Study House as an alternative to visit, as an interesting place and provide additional knowledge. The methods used in this activity are preparation, visit and evaluation. The result of this dissemination is that the OSF Semarang Study house is an interesting place to visit with relics of interesting items to be known by students and the visiting public. Arrangement of items in a neat and attractive room will make students and the public feel at home and will visit again