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• documents and communicates the data, algorithms, and expert judgments used to develop models;

• documents and implements best management practices to use models consistently and appropriately;

• establishes and implements criteria so that model-based decisions satisfy regulatory requirements and Agency guidelines;

• facilitates information exchange among model developers and users so that models can be iteratively and continuously improved;

• proactively anticipates scientific and technological developments so EPA is prepared for the next generation of environmental models.

Given this foundational role, models themselves can become part of the controversy over environmental initiatives.  Parties impacted by EPA regulations have at times successfully challenged these regulations in court by questioning the validity of the models upon which they were based. EPA's Information Quality Guidelines (PDF 378 KB, 57 pages, info about PDF) establish a process for parties impacted by the Agency's use of models to question the data, methods, and assumptions underlying these models.

In a 2002 memorandum, "Strengthening Science at the U.S. Environmental Protection Agency," the Administrator listed the CREM as a priority itemto develop the policy guidance necessary to facilitate appropriate model development and application within the regulatory context.

As of December 4, 2006, the CREM and CREM workgroup members are: