[영문]A randomized controlled trial was implemented with groups of foster-carers to test the effectiveness of cognitive?behavioural methods in the management of difficult behaviour. Contrary to expectations, no statistically significant differences were found between the groups with regard to behaviour management skills, the frequency and/or severity of behavioural problems, and placement stability. In contrast, foster-carers expressed satisfaction with the overall training programme and increased confidence in dealing with difficult behaviour. Discussion of the results focuses on a number of competing explanations for such findings and concludes with recommendations for future work.