This research report describes a process evaluation of the Signs of Safety (SofS) implementation process within the OSD department (OSD = ‘Afdeling Ondersteuningscentra en Sociale Diensten Jeugdrechtbank’ in Dutch = ‘Youth Care Support Centers and Youth Court Social Services’ in the Flemish part of Belgium) and its perceived impact. The process evaluation set three research objectives, namely, to gain insight into: 1) the various elements that ensure a sound SofS implementation; 2) the ‘breadth’ and ‘depth’ of the current SofS practice within the OSD department and 3) the meaningful elements of the implementation for the client system and their network, OSD-staff and external professional partners. Answers to these research questions were formulated using: insights from previous international implementation research (Work Package 1), an online survey (Work Package 2), individual structured interviews (Work Package 3), and a limited number of case studies (Work Package 4). A total of 208 OSD-employees, clients and their network, and external professional partners participated in the research.