The objectives of the Regional Science Topic Workshops are to: (1) establish a better crossagency understanding of the science applicable to specific Region-selected human health and/or ecological topics, and (2) develop a network of EPA scientists who will continue to exchange information on these science topics as the Agency moves forward in planning education, research, and risk management programs. Each year the EPA Regions identify priority science topics on which to conduct workshops. The workshops address the science issues of greatest interest to the Regions on the selected topic area. Each workshop is planned and conducted by a team of Regional, ORD, and interested Program Office scientists, led by a Regional chairperson and facilitated by one or more Regional Science Liaisons to ORD. Participants maintain the cross-agency science networks they establish at the workshops through planned post-workshop projects and activities, such as the identification of collaborative research opportunities, creation of information sharing mechanisms such as interactive web sites, and development of science fact sheets for Regional use.