<![CDATA[21st century learning focuses on student-centered learning, no longer teacher-centered. In 21st century learning, it encourages students to have collaboration skills. In the classroom learning process, collaboration abilities can be measured by working on LKPD (students worksheet) based on collaboration abilities. This research aims to develop LKPD learning media based on collaboration ability rubrics, to determine the level of validity, practicality and effectiveness of LKPD material on environmental change based on collaboration ability rubrics. This research was carried out at SMA Muhammadiyah 3 Jember. This type of research is development research, with a 4D development model. Data collection used teacher and student needs assessment questionnaires, validation tests and continued with student response assessments and pretest posttest trials. Based on data analysis, the results obtained were that the average validity test by three validators was 91.30% in the "very valid" category. The next trial, namely practicality in the form of a student response questionnaire, had an average of 93.26% in the "very practical" category, followed by an effectiveness test in the form of a pretest and posttest assessment which had an average N-gain of 0.59 with the effectiveness category " currently". From the effectiveness results, you can determine students' collaboration abilities through the application of the 21'CLD collaboration rubric. The product of this research is an LKPD on environmental change material based on a rubric for 21st century learning collaboration skills.]]>
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