The stewardship model has been adopted as a system of governance in several countries. In Italy, the Ministry of Health has proposed the use of the stewardship model for implementing the activities of the National Prevention Plan 2010-2012. The authors present the conceptual foundations and methodology used in the development of an assessment tool (audit tool) for evaluating the level of implementation of the stewardship model with regards to the activities of the national prevention plan in all Italian regions.