Within Vietnam, the environmental risks of transgenic plants, managing transgenic products safely, and building modern labs to assess their safety has received increased investment and research. This book is the first scientific effort to synthesize information relevant to GM crops in Vietnam, taking Bt cotton as an example. It can be used as a technical manual to enable Vietnamese scientists to evaluate the potential environmental impacts of Bt cotton varieties prior to commercialization, and provides guidance for environmental risk assessment of any transgenic crop.