A survey of research and experimentation in the field of stuttering is presented for those engaged in teaching or studying speech therapy, speech pathology, and psychology. The background to stuttering is discussed as are definition, diagnosis, and measurement. The perceptual, organic, perseverative, expectancy, diagnosogenic, and conflict theories of stuttering are discussed, and genetic, organic, and personality factors in stuttering are considered. Experimental investigations are presented of three basic phenomena of stuttering including the consistency and expectancy effects, the adaptation effect, and spontaneous recovery. Studies are described of delayed auditory feedback, the rhythm effect, and operant conditioning in the modification of stuttering. Each chapter contains conclusions regarding studies presented. (GD)