This article provides a review and analysis of habit reversal, a multicomponent procedure developed by Nunn (1973, 1974) for the treatment of nervous habits, tics, and stuttering. The article starts with a discussion of the behaviors treated with habit reversal, behavioral covariation among habits, and functional analysis and assessment of habits. Research on habit reversal and simplified versions of the procedure is then described. Next the article discusses the limitations of habit reversal and the evidence for its generality. The article concludes with an analysis of the behavioral processes involved in habit reversal and suggestions for future research.DESCRIPTORS: habit reversal, habit disorders, tics, nervous habits, covariation, functional analysis, awareness training, competing response training, social supportThe early 1970s saw the development and evaluation of a number of new behavioral technologies. Azrin and colleagues were responsible for many applications of these behavioral procedures to treat clinical problems such as nervous habits (Azrin & Nunn, 1973), tics (Azrin, Nunn, & Frantz, 1980b), stuttering (Azrin & Nunn, 1974), alcohol abuse (Hunt & Azrin, 1973), enuresis (Azrin & Foxx, 1971), and aggressive and disruptive behaviors (Foxx & Azrin, 1972). Habit reversal, a procedure used to treat nervous habits, tics, and stuttering, was one of the successful treatments developed and evaluated in this era. Like many behavioral interventions at that time, habit reversal was a treatment package consisting of numerous individual treatment components implemented together to achieve maximum reductions in the targeted problem (Azrin & Address all correspondence to Raymond G. Miltenberger, Department of Psychology, North Dakota State University, Fargo, North Dakota 58105 (E-mail: miltenbe@badlands.nodak.edu). Nunn, 1973Nunn, , 1977. Because the goal of the early research on habit reversal was to produce immediate and lasting decreases in the occurrence of habit behaviors, analysis of the individual treatment components or elucidation of the behavioral mechanism responsible for the success of the procedure was not a focus of investigation at the time.More recently, researchers have investigated aspects of this robust treatment package, including simplified versions and variations