The urgency and importance of properly conducting a risk assessment,and all the various attributes of the assessment, will remain a significant issue for years to come. STP 1317 explores the use of modeling in developing risk assessments for a variety of environmental situations, including human-health assessments, site-specific assessments, and ecosystem-level assessments.

32 peer-reviewed papers examine several aspects to consider when conducting a risk assessment, including:

• When is Risk Assessment the Right Tool?

• Communication of Risk Assessment

• Model Selection and Problem Analysis

• Data Quality and Uncertainty.