"The article outlines some of the ways in which an understanding of policymaker psychology and factors such as group dynamics and political context are reflected in the grey literature, and the implications of this for understanding the role of storytelling in political advocacy. It highlights practical advice about storytelling that emerges from the literature, and presents four case studies illustrating aspects of storytelling in action. It concludes by identifying the implications for scientists and other advocates of“evidence informed policymaking”, practitioners and policymakers." (Abstract)