In cooperation with its American developers, the Parent Management Training Oregon (PMTO) model was introduced into the Dutch youth care system at the beginning of 2006. In general, implementing new interventions in practice is no simple matter. Several factors related to the socio-political context, the organizational context, the intervention itself and the professional can facilitate or hinder the implementation process. Therefore, it is essential to establish a good understanding of the factors that may influence the implementation of PMTO in the Dutch context. This paper presents preliminary results of an implementation study of PMTO in four Dutch pilot organizations. Managers as well as (PMTO) therapists completed questionnaires and were interviewed about factors that had a positive or negative effect on the implementation of PMTO. In order to successfully implement PMTO at a national level an implementation strategy should be designed that takes all identified key factors into account. (Contains 1 figure and 2 tables.)