Book excerpt: This volume describes the four types of information that are commonly used to assess contaminated sediments, including sediment & pore water chemistry data, sediment toxicity data, benthic invertebrate community structure data, and bioaccumulation data. Some of the other tools that can be used to support assessments of sediment quality conditions are also briefly described, including fish health assessments. The information compiled for each of the tools includes: descriptions of its applications, advantages, & limitations; discussions on the availability of standard methods, the evaluation of data quality, methodological uncertainty, and the interpretation of associated data; and recommendations to guide the use of each of these individual indicators of sediment quality conditions. Guidance is also provided on the interpretation of data on multiple indicators of sediment quality conditions.