Written by researchers from the cutting edge of botany, entomology, plant pathology, and other agricultural and environmental sciences, this book explores critical research on pollen movement, spread of transgenes in natural communities, fitness effects, resistance development, and unpredicted impacts on target and non-target organisms. These topics are explored in contexts ranging from Bt corn events and viral resistant oats to transgenic salmon and altered malarial vectors. The book addresses theoretical and information gaps and offers historical insights into factors that may affect risk assessment and risk management decision-making at the community, national, and international levels.