This study reports on a study of the influence of students' goal-speed versus mastery-as they solve a computer science problem collaboratively. We conducted a study with 254 university students enrolled in introductory computer science, pairing based on the goal they reported for that day. Results with a comparison condition show that matching by goal may not benefit student learning unless other factors are also considered. However, for students who hold a mastery goal, pairing with another

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... dent who shares that goal may significantly improve the learning experience. These results advance our understanding of how we might adapt collaborative learning practices based on students' goals.