only in the presence of the discriminative stimulus is an illustration of stimulus control. More recently behavior analysts have been focusing on conditions that occur prior to the circumstances for the current behavior of concern that increased the likelihood of the behavior occurring or not occurring. These conditions have been referred to variously as "Setting Event", "Establishing Operations", and "Motivating Operations" by various researchers in their publications. Verbal behavior B. F. Skinner's classification system of behavior analysis has been applied to treatment of a host of communication disorders. Skinner's system includes: Tact – a verbal response evoked by a non-verbal antecedent and maintained by generalized conditioned reinforcement. Mand – behavior under control of motivating operations maintained by a characteristic reinforcer. Intraverbals – verbal behavior for which the relevant antecedent stimulus was other verbal behavior, but which does not share the response topography of that prior verbal stimulus (e.g., responding to another speaker's question). Autoclitic – secondary verbal behavior which alters the effect of primary verbal behavior on the listener. Examples involve quantification, grammar, and qualifying statements (e.g., the differential effects of "I think..." vs. "I know...") Skinner's use of behavioral techniques was famously critiqued by the linguist Noam Chomsky through an extensive breakdown of how Skinner's view of language as behavioral simply can't explain the complexity of human language. This suggests that while behaviorist techniques can teach language, it is a very poor measure to explain language fundamentals. Considering Chomsky's critiques, it may be more appropriate to teach language through a Speech language pathologist instead of a behaviorist. For an assessment of verbal behavior from Skinner's system, see Assessment of Basic Language and Learning Skills. Measuring behavior When measuring behavior, there are both dimensions of behavior and quantifiable measures of behavior. In applied behavior analysis, the quantifiable measures are a derivative of the dimensions. These dimensions are repeatability, temporal extent, and temporal locus. Repeatability Response classes occur repeatedly throughout time—i.e., how many times the behavior occurs. Count is the number of occurrences in behavior. Rate/frequency is the number of instances of behavior per unit of time. Celeration is the measure of how the rate changes over time. Temporal extent This dimension indicates that each instance of behavior occupies some amount of time—i.e., how long the behavior occurs. Duration is the period of time over which the behavior occurs. Temporal locus Each instance of behavior occurs at a specific point in