EPA’s Ecological Risk Assessment ToolBox (EPA EcoBox) is a compendium of tools that provides links to guidance documents, databases, models, reference materials, and other related resources.  Information and tools are organized according to 6 topics areas of interest to ecological risk assessors. Each of these tool sets provides information on how these topics are considered within the context of the phases of an Ecological Risk AssessmentEcological Risk AssessmentA process that evaluates the likelihood that adverse ecological effects may occur or are occurring as a result of exposure to one or more stressors. Stressors are defined as any chemical, biological, or physical entity that can induce an adverse response on ecological individuals, populations, communities, or ecosystems. (ERA).