The Mercury Research Strategy describes the strategic approach for ORD's mercury research program. Using as a technical foundation the EPA 1997 Mercury Study Report to Congress, the Mercury Research Strategy presents the key scientific questions to be addressed over the next five years. It also describes the research needed to answer those questions. The Mercury Research Strategy not only provides strategic directions, but serves as an important budget tool. It is central to the preparation of a multi-year implementation plan for mercury and methylmercury research. This multi-year plan enables EPA to track the progress being made in the mercury research program, as required by the 1993 Government Performance and Results Act.