Functional Behavior Assessment (FBA): A Parent’s Guide

Understanding the reason behind your child’s behavior is the first step in creating meaningful change. A Functional Behavior Assessment (FBA) is a core process in ABA therapy that helps identify why a behavior is happening and how best to address it.

What Is an FBA?

An FBA is a structured method used by Board Certified Behavior Analysts (BCBAs) to determine the function—or purpose—of a specific behavior. It involves observing your child, gathering input from caregivers, and analyzing patterns to find out what is triggering and maintaining the behavior.

Key Steps in an FBA:

Define the Behavior: Clear, observable terms (e.g., “hits others during transitions” rather than “is aggressive”).
Collect Data: Using ABC (Antecedent, Behavior, Consequence) logs, staff and parents document when, where, and how behaviors occur.
Interview Stakeholders: Parents, teachers, and therapists provide insight into possible causes.
Direct Observation: The BCBA observes the child across different settings and times.
Determine the Function: Common functions include escape, attention, access to items, or sensory stimulation.

Why It Matters

Once the function is known, ABA professionals can design effective behavior intervention plans (BIPs) that teach alternative behaviors. For example, a child who hits to escape a task can be taught to ask for a break.

Parents who understand the function of a behavior can respond consistently and support their child more effectively. It’s a cornerstone of collaborative ABA therapy.

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