An NRC committee will develop scientific and technical recommendations for improving the risk analysis approaches used by the U.S. Environmental Protection Agency (EPA). Taking into consideration past evaluations and ongoing studies by the NRC and others, the committee will conduct a scientific and technical review of EPA's current risk analysis concepts and practices. The committee will consider analyses applied to contaminants in all environmental media (water, air, food, soil) and all routes of exposure (ingestion, inhalation, and dermal absorption).