Lochman, Coie, Underwood and Terry (1993) developed and empirically tested a social relations intervention program that addressed social problem-solving, positive play training, group-entry skill training, and dealing with strong negative feelings. The program was conducted over 26 individual half-hour sessions and 8 half-hour sessions of group-play. In a sample of 52 African-American early-adolescent children, youth who participated in the training group exhibited decreased levels of aggression towards their peers when compared to youth from the control group (Lochman, Coie, Underwood, & Terry, 1993).