Sustainability assessment is fundamental to improving the long-term viability of agricultural systems. A variety of assessment tools have been developed for the practitioner to evaluate sustainability at multiple levels, from field to farm. This report is a compilation of annotated references on assessment methods from published and unpublished sources. Each section contains a methodological description, a list of published sources, and a list of relevant programs and contacts. While not exhaustive, the report presents a range of tools and applications that are currently in use or are in testing for future use.