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Results

#1. A behavior analyst has been observing a client’s disruptive behavior for several weeks. Initially, they defined disruptive behavior as any vocalization louder than a whisper or any instance of leaving their seat without permission. Over time, the analyst’s interpretation of disruptive behavior subtly changed, and they began to consistently record instances of fidgeting as disruptive, even though it wasn’t part of the original operational definition. This gradual and unacknowledged alteration in the measurement criteria is most accurately described as

Observer bias

Observer drift

Reactivity

Interobserver agreement (IOA) inconsistency

Observer drift occurs when observers unknowingly alter the way they apply a measurement system leading to a gradual and subtle shift in how they interpret or record target behaviors over time This can cause their data to deviate from the true occurrence of the behavior compromising the validity and reliability of the data In this scenario the analysts definition of disruptive behavior changed from the initial operational definition to include fidgeting which was not originally part of the criteria Observer bias refers to a tendency for observers to see what they expect to see Reactivity refers to a change in behavior due to being observed IOA inconsistency is a result of rather than the cause of the changing criteria

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