Governments the world over require scientific knowledge to inform policy makers' decision-making processes. The recontextualization of this information for nonscientific audiences has received much attention, though it has primarily focused on publicly available texts. Little is known about the discursive nature of how science is transformed and repurposed and the confidential writing performed by boundary organizations that are working between science and policy. This ethnographic study explores the collaborative discursive activity involved in efforts by a boundary organization--the Council of Canadian Academies--to recontextualize science for policy makers. The analysis opens the discursive black box of the genre system and intermediary genre sets involved in one project, which led to the publication and distribution of the boundary object of an advisory report, "Older Canadians on the Move." I claim that the discursive boundary work involves a complex genre system containing several sequential genred activities through which science is transformed and a boundary object created.