Technical Abstract: We present an overview of USDA Agricultural Research Service (ARS) computer models and databases related to pest management science, emphasizing current development projects in environmental risk management. ARS has a unique national interdisciplinary team of researchers in hydrology, soil and plant science, systems analysis, and pesticide science who have networked to develop empirical and mechanistic computer models describing the behavior of pests, pest responses to controls, and the environmental impact of pest control methods. Historically, much of this work has been in support of production agriculture and in support of the conservation programs of our "action agency" sister, the Natural Resources Conservation Service (formerly the Soil Conservation Service). Because we are a public agency our software/database products are generally offered without cost, unless they are developed in cooperation with a private-sector cooperator. Because we are fundamentally a research organization, with development of new science as our highest priority, these products tend to be offered on an "as-is" basis with little follow-up user support except for cooperating R & D relationsohip with other scientists. However, rapid changes in the technology for information analysis and communication continually challenge our way of doing business.