<![CDATA[The complexity of the problems that occur in classroom learning, lead students to have century skills to support their lives in the future. Thecentury skills that students must have consist of 4C, namely critical thinking and problem solving, creativity and innovation, communication and collaboration. This research aims to develop a valid, practical, and effective project-based e-worksheet to improve critical thinking skills on Boyle's legal material. This type of development research is Design and Development Research (DDR) which were adapted from Richey Client (2007) using an assessment of validity tests, practice tests consisting of readability tests, teacher perception tests and student response tests, effectiveness tests consisting of tests normality, N-Gain, Paired Sample T-Test and Independent Sample T-Test. In the validity test results, the average score from the three validators was 3.57, with the average result of material and design validation being 3.53 in the very valid category and material and construct validation of 3.60 in the very valid category. The results of the practicality test obtained an average score of 83.1% for the readability test in the legible category, the student response test was 82% in the very good category, while for the teacher perception test it was 94.7%. So the average practicality test score was 86.6% in the very practical category.]]>
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