The Jigsaw classroom under test: No effect on intergroup relations evident

Two quasi‐experiments with intervention and control classes investigated effects of the Jigsaw classroom on intergroup relations, with 11 years old in grade 6 (Study 1) and 13–15 years old in grades 8–10 (Study 2). Both studies investigated developments in majority members' outgroup attitudes, intergroup friendship and empathy. They also investigated attitudes towards school among all the students. Study 2 added assessments of common ingroup identity in the majority sample and considered outgroup attitudes in the minorities' sample. Particularly in Study 2, an effort was made to ensure an accurate implementation of Jigsaw. The studies could not confirm that Jigsaw had effects on intergroup relations. Study 2, using adolescents as participants and 11 Jigsaw classes, found no effects of Jigsaw. In Study 1, one of the two Jigsaw classes had a statistically significant, minor favourable development along outgroup attitudes. However, this development may have been an effect of having two teachers (and few students in the class); no similar development was uncovered in the second Jigsaw class (with one teacher). The data question the frequent optimism on behalf of the Jigsaw classroom as an effective means to counter prejudice. Copyright © 2008 John Wiley & Sons, Ltd.