34 papers debate the merits of test development, animal andplant culture, nutrition and testing, and the lack of interagencyharmony. Papers are divided into the following categories:

• Benefits of Interagency Harmonization of Methodology

• Review of Common Modes of Toxic Action

• Field Techniques

• Interpretation of Microcosm Data

• Quality Assurance in Ecotoxicity Testing

• Sediment Toxicity Testing

• Culturing and Testing of New Organisms

• Nutrition and Testing

• Target Toxicant Analysis