This thesis focuses on the effectiveness of a family-centered approach (in Dutch “DMOprotocol”, further referred to as the family-centered approach), designed for monitoring and enhancing children’s social-emotional development in Preventive Child Healthcare (PCH). The effectiveness study took place at a Dutch PCH organization (Icare JGZ). In a quasi-experimental design, regions in which the family-centered approach had already been implemented (northern and southeastern part of Drenthe) were compared to regions in which care-as-usual had been maintained (northern part of Overijssel). The aim was to assess the added value of the family-centered approach from different perspectives. Therefore several research questions were answered in analyses that are
reported in different chapters of this thesis.