Is it true that one way to complete a descriptive functional behavior assessment is to derive a function based on interviews and questionnaires?

The statement that deriving a function based on interviews and questionnaires represents one way to complete a descriptive functional behavior assessment is indeed true. Functional behavior assessments (FBAs) aim to identify the reasons behind specific behaviors, and using interviews and questionnaires is a common approach to gather information about the behavior in question.

Interviews with individuals who interact with the person exhibiting the behavior—such as parents, teachers, or caregivers—can provide valuable insights into the context in which the behavior occurs, the specific triggers, and the consequences that follow the behavior. Questionnaires may also standardize the information-gathering process, allowing for a systematic way to analyze patterns of behavior.

This method is part of a broader practice of assessment within the field of applied behavior analysis, where triangulating data from multiple sources leads to a more comprehensive understanding of the functions behind behavior. Therefore, this approach can be considered valid within the methods of conducting descriptive FBAs.