This study examined the extent to which patterns of involvement in interpersonal cognitive problem solving (ICPS) groups were predictive of improvements in ICPS skills. Thirty-one 7–8-year-old children were assigned to experimental or control groups. Participants in the experimental group participated in six sessions of ICPS group work. All participants were tested for the ICPS skills of alternative solutions thinking (AST) and consequential thinking (CT) immediately before and after the group work period. As predicted, the experimental group showed significantly greater improvements in AST and CT skills than the control group. Means-end thinking was significantly correlated with improvements in AST and CT, level of involvement and positive behaviour within the groups were predictive of improvements in AST but not CT. Findings indicated the importance of group dynamics for ICPS outcomes and are discussed in relation to their theoretical and practical implications.