chapter Executive Summary. Recommendations for Assessing the Risks of Herbicides and -- chapter 1 Introduction and Background -- chapter 2 Guidance, Recommendations, and Proposed Decision Scheme for Additional Aquatic Macrophyte Tests -- chapter 3 Regulatory Issues Concerning Effects of Pesticides on Aquatic Macrophytes -- chapter 4 4Chapter Characterizing and Assessing Risk Using Case Studies -- chapter 5 5Chapter Reports of Workgroups and Follow-up Investigations -- chapter 6 6Chapter Keynote Presentations.