Ecological, genetic, and social factors affecting environmental assessment of transgenic plants -- Scientific assumptions and premises underpinning the regulation and oversight of environmental risks of transgenic plants -- APHIS regulatory policy for transgenic organisms -- Case studies of APHIS assessments -- Analysis of APHIS assessments -- Postcommercialization testing and monitoring for environmental effects of transgenic plants -- The future of agricultural biotechnology -- References -- Appendix A: Workshop to assess the regulatory oversight of GM crops and the next generation of genetic modifications for crop plants: agenda -- Appendix B: Workshop presenters/panelists -- Appendix C: "Dear colleague letter" -- Appendix D: "Dear colleague letter" recipients