Brief Parent Training (BPT) is a short-term intervention (3-5 sessions) delivered by regular staff in municipal child and family services. BPT is based on social interaction learning theory and Parent Management Training, the Oregon model (PMTO) and promotes parenting skills in families with children who either are at an early stage of problem behavior development or have developed conduct problems. This study examined the effectiveness of BPT compared to regular services in primary care settings at post assessment. Participants were 216 children (3-12 years) and their parents who were randomly assigned to BPT or the comparison group. Data were collected from parents and teachers. Significant intervention effects emerged for caregiver assessments of parenting practices, child conduct problems, and social competence. The results suggested that BPT had beneficial effects for families, although the generalization of the effects to school was limited.