This Issue Paper identifies the nature of gene flow and discusses the relatively limited situations in which it is likely to cause economic problems in the production of commercial biotech crops.

Following a 2-day workshop sponsored jointly by CAST and the U.S. Department of Agriculture-Animal and Plant Health Inspection Service, an 11-member task force undertook the writing of this publication to present in summarized form the contributions made by the diverse group of workshop participants, as well as those who submitted comments before and after the formal meetings.