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Results

#1. A BCBA trained a client’s parents to implement a Differential Reinforcement of Incompatible Behavior (DRI) procedure. The parents successfully demonstrated fidelity for a week, consistently implementing the intervention as instructed. However, upon a follow-up visit two weeks later, the BCBA observed the parents consistently implementing a Differential Reinforcement of Alternative Behavior (DRA) procedure instead of the trained DRI. Which of the following best explains this change in intervention implementation?

A) The initial training was inadequate, leading to a skill deficit in implementing DRI.

B) Observer drift, as the BCBA’s observational criteria for DRI had unintentionally changed.

C) Reactivity to the BCBA’s presence, causing a temporary change in parent behavior.

D) Treatment drift, where the intervention unintentionally changed over time from its original plan.

The text explicitly defines and discusses treatment drift in this exact context Treatment drift refers to the phenomenon where an intervention over time deviates unintentionally from its original planned procedure The scenario describedparents initially implementing DRI correctly for a week then shifting to DRA after two weeks without direct supervisionis a classic example of treatment drift The text highlights that treatment drift is natural and that its up to us as BCBAs to provide great supervision and make sure treatment drift doesnt happen The text rules out inadequate training by stating the parents were competently implementing for a week Reactivity is also ruled out because the parents had already demonstrated competence and the change occurred over a period without the BCBAs presence Observer drift is a change in the observers measurement criteria not a change in the intervention being implemented by the practitioner

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