Friendship patterns as well as maternal child-rearing attitudes and practices associated with the manifestation of conduct problems were studied. On the basis of the Connors Teacher Rating Scale, 28 no-conduct and 22 conduct problem boys were selected from Primary 6 classes of two schools in Singapore. A1150 boys listed names of their three best friends, and their mothers answered a questionnaire about their child-rearing attitudes and practices. The friends of the boys were also rated along the same scale of conduct problems. Results showed that boys with conduct problems had as their friends at least one boy who exhibited similar behavioural problems. In contrast, boys who manifested no conduct problems had friends who displayed no problems. Results further showed that mothers of boys with conduct problems, as compared to mothers of boys with no conduct problems, tended to be more equalitarian and less exclusive of outside influences. No differences were found in maternal practices. These results suggest a dynamic interplay of peer and maternal factors in the manifestation of conduct problems among Singaporean boys.