It is important to pay particular attention to children’s behaviour problems because of the adaptation difficulties these children may face over the medium and long term. If children have these problems at an early age, they may be at risk of adaptation problems, such as dropping out of school, drug addiction, being rejected by other young people, interpersonal problems, and delinquent behaviour. Early intervention is important in counteracting this problematic development trajectory. Intervention with children who have behaviour problems is a major challenge for day-care personnel. This article is based on an intervention program offered to daycare personnel to help them deal with these types of situations. The data, gathered during a qualitative process, reveals that participants find that the program has positive effects. By doing a better analysis of the needs that children express through these behaviours, they are able to choose better adapted and more effective intervention strategies. However, they emphasize that effective intervention with a child in difficulty requires the concerted action of everyone working with the child, thus the importance of working with the parents during the intervention process.