Group contingencies have the advantages of encouraging individual students to collectively feel responsible for appropriate and inappropriate classroom behaviors and have shown effectiveness in improving students' behavior. The purpose of this study was to investigate the effects of a random dependent group contingency on the on-task behaviors of six high school students with high incidence disabilities in a resource classroom. The study used an ABAB reversal design, and the results of the study indicated that the random dependent group contingency intervention was positively associated with increases in on-task behaviors for three of the six participants. Limitations and implications are discussed in relation to dependent group contingencies for high school students. C 2009 Wiley Periodicals, Inc.