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“Stubborn” is a subjective judgment and not observable or measurable. Options A, B, and D provide objective data (accuracy, duration, frequency). Objective notes ensure accurate progress monitoring and ethical reporting, while subjective notes introduce bias and reduce reliability.

Whole-interval recording requires the behavior to occur during the entire interval to be recorded as present. For example, if the client is on-task for the full 30 seconds, it is marked “yes.” Partial-interval (B) records behavior at any point, momentary time sampling (C) checks at the end, and frequency (D) counts total instances. Whole-interval is often used when the goal is to increase behaviors like engagement or sustained attention.

DRO delivers reinforcement when the target behavior does not occur during a set interval. For example, if the child does not engage in aggression for 5 minutes, reinforcement is given. Option B is DRA, option C is DRI, and option D is DRL. DRO reduces problem behavior by reinforcing its absence, but replacement skills should also be taught for long-term effectiveness.

Rate is calculated as the frequency of behavior divided by the observation period. For instance, if a child claps 15 times in 30 minutes, the rate is 0.5 claps per minute. This standardizes data across sessions of different lengths, making comparisons easier. Latency (B), momentary time sampling (C), and duration (D) are different forms of measurement. Rate is particularly useful for evaluating changes in behavior over consistent time frames.

DRO (Differential Reinforcement of Other Behavior) involves delivering reinforcement when the target behavior (in this case, hand flapping) does not occur during a specified interval. For example, if the client refrains from hand flapping for 2 minutes, the RBT provides reinforcement. This strategy strengthens alternative, appropriate behaviors by reinforcing their occurrence in place of the undesired behavior. Option B describes Differential Reinforcement of Diminished Rates (DRD), while option C introduces punishment, which is not DRO. Option D (ignoring) may resemble extinction but lacks reinforcement for alternative behaviors. DRO is function-based and helps reduce problem behaviors by rewarding the absence of the behavior across time.