Article Descriptors toilet training; training methods; severe mental retardation; multi ple disabilities; developmental disabilities; enuresis; encopresis; selfcare skills The Azrin and Foxx toileting study published in 1971 represented a culmination of earlier research efforts regarding the toilet training of the severely and pro foundly retarded client. This article uses the landmark study to provide a frame of reference for reviewing a decade of toilet training research. Efforts attempting to replicate the original study have been few in number and have yielded equivocal results. Modifications of the original study have added more information and have generated new areas of inquiry that give direc tion to toilet training research for the next decade.