Abstract
This study aims to design, design and develop a learning intervention.-based Practicum Guide problem-based learning to improve the critical thinking skills of class XI SMA students that are valid, practical, and effective. The instrument used was a validity questionnaire and a practicality questionnaire as well as a matter of effectiveness. The validity and practicality data analysis technique uses a Likert scale scoring and the effectiveness uses a t-test using SPSS 2.2. Based on the development and trial of problem-based learning to improve the thinking skills of students in class XI SMA, it was concluded that the results of the validity and practicality tests met the very valid criteria. The results of the effectiveness test have effective criteria.
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