The following cursory review is taken from the Literature Review on Service Learning conducted by Mr. James Krug (1991) at the University of Colorado. Mr. Krug's research has been on the effects of service learning on four groups of high school young people: at-risk youth in a special program, student assistants (primarily minority) within the school, nature guides, and tutors at a primary school. Preliminary results indicate that, while all the experimental groups gained on measures of potency, activity involvement in the community, self-concept and other factors, the statistically significant growth at the .01 and .05 levels was found almost exclusively with the at-risk and minority young people. The control group, as predicted, did not change on the pre-post instruments.
Krug, James and Kraft, Richard J., "Preliminary Review of Research in Service Learning" (1991). Special Topics, General. 73.