This article summarizes the different instruments available to assess cooperation in school settings, on the one hand, and the pros and cons related to them, on the other hand. Examination of almost 230 documents revealed that three principal categories of measures are available: questionnaires, classroom observations, and trust games. aside from some potential biases, the simplicity of questionnaires and their brief administration time render them a relevant option to measure cooperative attitudes. Classroom observation practices offer a high ecological validity but their potential to produce a generalizable measure of the individual tendency to cooperate still needs to be demonstrated. Trust games provide direct indices of cooperation while avoiding certain biases related to its measure. Therefore, despite the high cost related to its administration, this task constitutes an inte - resting avenue for educational researchers who wish to evaluate cooperation among students.