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Problem solving and collaborative skills are part of the 21st century skills that students need to have, so it is necessary to develop a model of learning that can enhance those abilities. This study aims to improve collaborative skills and student problem solving through learning Project Based Peer Interaction (SPBPI) Science. The research subjects were students who took the Basic Physics II academic year 2018/2019 at the Universitas Nusantara PGRI Kediri in the Mechanical Engineering Program. The study design used one-group pretest-posttest. Data collection uses observations, tests, and questionnaires. The data analysis technique uses quantitative and qualitative descriptive inferential statistical test analysis. The results of the study show the existence of collaborative abilities and problem solving of students through learning Project Project Peer Interaction (SPBPI).