In recent years. operant conditioning techniques have been effectively used to modify ~ variety of behaviors. For the most part, . , the modification of stuttering behavior has relied solely on the use of punishment. The shaping of "fluencyll through differential rein. ' forcement has been reported as a behavioral approach for the treat ment of stuttering; however, the effectiveness of this technique in combination with other "teaching" tools, such as, modeling, instruc tion, and explanation has not been reported in the literature.The purpose of this study was to construct behavioral defini tions of terminology utilized in a stuttering treatment program at Portland State University to produce "self... monitored normal, fluent speech" and to structure the procedures of this program with regard to baseline, conditioning, and extinction in order to provide a base for further research leading to the standardization of procedures for this program.A 35 year old male was chosen as the subject for this study. AcknowLedgetnents and appreciation of their help and support is extended to: the judges who rated "severity of stuttering ll --Dr. Special gratitude is expres sed to Dr. Robert L. Casteel, my chairman, for suggesting this study; for the sharing of his ideas for, and approaches to, the correction of stuttering, without which this project would never have been initiated; for the giving of his time to question, discuss, criticize and praise my methods of approach to the treatment of stuttering; and for the guidanc~ and reassurance he gave me throughout this study.