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Abstract This research is a quasi-experimental study with a non-equivalent control group design that aims to test the effectiveness of the application of collaborative problem-solving learning to students problem-solving abilities. The sample used in this study consisted of 75 students consisting of 37 students in the experimental class and 38 students in the control class in one of Pekanbaru Riau Middle School, Indonesia. The instrument in this study was the students initial ability test before being given treatment and tests after being given the Collaborative Problem Solving learning treatment. In this study found that problem-solving abilities, students who received Collaborative learning treatments Problem solving got better results than students who were taught with conventional learning.