Abstract
This study aims to develop a valid and effective chemistry worksheet on project-based learning (PBL) in order to shape and train students’ habits of mind. This is research and development (R & D) study with reference to the ADDIE procedural model that has been modified in previous studies with steps: potential problem observation, product design, design validation, implementation and evaluation. Worksheet validation is conducted by 2 validators with 3.8 validation results with a valid category. The result of this study on the implementation test on 20 students showed that the N-Gain test results of 0.73 with high categories and students’ habits of mind assessed through questionnaires. It also had an average score of 74.5 with good categories. The result of students’ habits of mind observation indicated that an increase in the three indicators from the first meeting to the last meeting. Based on the results of the study, it can be concluded that the development of chemistry worksheet on project-based learning is valid and effective to train and form students’ habits of mind. This research finding also indicated that there is a positive effect between habits of mind and student learning outcomes with a total effect of 68.4%.
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