This guidance developed in 2009 provides recommendations for the effective development, evaluation, and use of models in environmental decision making once an environmental issue has been identified. These recommendations are drawn from Agency white papers, EPA Science Advisory Board reports, the National Research Council’s Models in Environmental Regulatory Decision Making, and peer-reviewed literature. 

• Guidance Document on the Development, Evaluation, and Application of Environmental Models (PDF)(99 pp, 2 MB, March 2009)