Cooperative learning refers to instructional methods in which students work in small groups to help each other learn. Although cooperative learning methods are used for different age groups, they are particularly popular in elementary (primary) schools. This article discusses methods and theoretical perspectives on cooperative learning for the elementary grades. The article acknowledges the contributions from each of the major theoretical perspectives and places them in a model that depicts the likely role each plays in cooperative learning outcomes. This work explores conditions under which each perspective may operate, and suggests further research needed to advance cooperative learning scholarship.