A BCBA is designing a functional behavior assessment (FBA) for a client who engages in infrequent but severe aggressive outbursts. Direct observation has been challenging due to the low rate of the behavior. To develop a preliminary hypothesis about the function of the behavior, which assessment procedure would be the MOST appropriate first step?
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A
Conducting a trial-based functional analysis in a controlled setting.
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B
Implementing a descriptive assessment using ABC narrative recording in the natural environment.
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C
Administering a functional assessment screening tool (FAST) to caregivers.
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D
Initiating a reinforcer assessment to identify high-preference items.