The practical value ofthe quantitative analysis ofbehavior is limited by two methodological characteristics of this area of research: the use of (a) steady-state strategies and (b) relative vs. absolute response rates. Applied behavior analysts are concerned with both transition-state and steady-state behavior, and applied interventions are typically evaluated by their effects on absolute response rates. Quantitative analyses of behavior will have greater practical value when methods are developed for their extension to traditional rate-of-response variables measured across time. Although steady-state and relative-rate-of-response strategies are appropriate to the experimental analysis of many behavioral phenomena, these methods are rarely used by applied behavior analysts and further separate the basic and applied areas.Recently, a number of authors have begun to assess the importance of the matching law (Herrnstein, 1970) for the analysis of human behavior in natural settings. Pierce and Epling (1983), for example, reviewed the evidence for matching in the human operant literature, and others have suggested that matching has important implications for applied behavior analysis McDowell, 1981McDowell, , 1982Myerson & Hale, 1984a, 1984b Sidman, 1960, chaps. 8 and 9). Typically, an organism is exposed to a schedule of reinforcement, or some combination of schedules, for from 10 to 35 daily sessions, and measurements ofresponse and reinforcement rates are made in the final sessions when session-to-session variation is minimized and a stability criterion has been met. The data from earlier sessions are not reported or analyzed, and, in the case of matching law research, no predictions can be made about rates of behavior at these prior points.Applied researchers and clinicians seldom have the option of choosing between steady-state and transition-state strategies. In field settings, the task ofthe behavior analyst could be described as providing the change from one stable rate of response to another. Presumably, in reversal designs, baselines are characterized by higher rates of undesirable behavior and lower rates ofdesirable behavior, whereas the stable post-intervention rates of each would be reversed. Interventions in applied settings, however, like those in the operant laboratory, rarely produce an instant transition from one steady-state performance to another. Behavior change is often gradual, spanning several days or sessions before attaining a maintenance level; moreover, the shape 157