Improving Students’ Collaboration Skills Through Project-Based Learning on Environmental Change Material

Collaboration skills are one of the six life skills that are important to have in the 21st century,enabling students to work together, exchange ideas, and respect other people's opinions. This research aims toimprove collaboration skills through Project-Based Learning (PjBL) on environmental change material. Theresearch method used was a quasi-experiment with a nonequivalent pretest-posttest control-group design. Thesample for this research is high school students who are studying Environmental Change material. Collaborationskills questionnaires and observations of learning implementation were used as research instruments. The dataanalysis used was the Independent Sample T-Test and the N-Gain test. The results of the Independent Sample TTest show that the average posttest score for the control and experimental classes is significantly different by0.000. The collaboration skills of experimental class students obtained a mean of 86.39 in the very goodcategory, and the N-Gain test result was 0.465 in the moderate category. This increase is supported by theresults of learning implementation, with an average score of 89.89% in the very good category. This researchimplies that it can provide practical guidance for teachers interested in integrating PjBL into learning.