The purpose of this study was to investigate the effects of a program of syllable-timed speech production on kernel and accessory features of stuttering. Five adult stutterers participated in a 1-month program of metronome conditioning. Videotapes were made to monitor changes in speech behavior. All stutterers demonstrated a reduction in stuttering and in the use of accessory features. In addition, kernel features were also modified by this therapy approach. Operant procedures may be used to effect changes in behaviors supposedly learned through classical conditioning.