In this study, the purpose of analyzing how students' mistakes in building flat side rooms based on spatial abilities. This type of research is descriptive and qualitative. The sample used was 4 students which included 2 high school students in class XII with female gender, and 2 students of SMK class XII with male gender. The data collection technique is in the form of an instrument with a spaceability test, which consists of 4 description questions. The analysis technique used is based on watson criteria. Referring to Watson's criteria, students still make 4 mistakes caused due to several internal and external factors, these errors include incorrect data, improper procedures, skill hierarchy problems, and errors other than the seven above.
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