Social Skills Group Intervention (S.S.GRIN) 3-5 is a social skills curriculum for children in grades 3-5 (ages 8-12 years) who have immature social skills relative to peers (e.g., impulse control problems), are being rejected and teased by peers (e.g., experiencing bullying and victimization), or are socially anxious and awkward with peers. S.S.GRIN 3-5 is implemented in small groups and is intended to improve children’s peer relations by building basic behavioral and cognitive social skills, reinforcing prosocial attitudes and behaviors, and building adaptive coping strategies for social problems, such as teasing and isolation. The intervention is based primarily on social learning and cognitive behavioral theoretical perspectives, with an emphasis on the behavioral, cognitive, and emotional components of social problem solving.