This is the first step in a long-term effort to develop risk assessment guidelines for ecological effects. Its primary purpose is to offer a simple, flexible structure for conducting and evaluating ecological risk assessment within EPA.

This Framework served as the foundation for, and has been superseded by, EPA's 1998 Ecological Risk Assessment Guidelines.

• Framework for Ecological Risk Assessment (PDF)(57 pp, 1 MB, February 1992 , 630-R-92-001)