The soybean is one of the most important legume crops. Several technical advances over the past decade permit the soybean to be readily transformed, using a number of different procedures developed and optimized by numerous laboratories. Today most of the soybeans grown throughout the world carry an introduced gene for herbicide resistance and more commercially important traits will soon be available. The most widely used transformation systems are the cotyledonary node--Agrobacterium tumefaciens and the embryogenic culture-particle bombardment systems. With the sequencing of the soybean genome, high-throughput transformation will be needed for both crop improvement and determination of gene function.