Functional Behavior Assessment in Washington State: What Parents Need to Know

Your child has been suspended multiple times, or the school keeps calling you to pick them up early, or an IEP meeting devolved into a discussion about behavior rather than academics. At some point, someone mentions a "functional behavior assessment." Here is what that actually means, when Washington schools are required to conduct one, and how the results should drive what goes into your child's IEP.

What an FBA Is

A Functional Behavior Assessment (FBA) is an evaluation process designed to identify the underlying function — the reason or purpose — behind a student's problem behavior. The FBA doesn't just document what the behavior looks like; it investigates why it is happening. Common functions of challenging behavior include: avoiding a difficult task, escaping a sensory overload, seeking attention from a specific person, or communicating a need the student cannot express verbally.

The assessment typically involves direct observation of the student in multiple settings, review of school records and incident reports, interviews with teachers and parents, and structured data collection. The result is a hypothesis: "When X condition is present, this student engages in Y behavior because it produces Z outcome."

That hypothesis is not just diagnostic — it directly informs the Behavior Intervention Plan (BIP) that follows.

When Washington Schools Must Conduct an FBA

In Washington, there is no single statute that specifies an FBA is required in every disciplinary situation, but federal IDEA requirements and Washington's implementation under WAC 392-172A create clear obligations in specific contexts.

Manifestation Determination Review (MDR): When a student with a disability is removed from their educational setting for more than 10 cumulative school days in a year, the district must hold a Manifestation Determination Review. If the MDR team concludes that the behavior was a manifestation of the student's disability, the district must conduct an FBA — or review an existing one — and develop a BIP. This is a non-negotiable federal requirement that applies in Washington.

When behavior impedes learning: Under IDEA, the IEP team is required to consider — in the case of a child whose behavior impedes the child's learning or the learning of others — the use of positive behavioral interventions and supports. While the law uses "consider" rather than "require," OSPI guidance makes clear that documented, recurring behavior that interferes with educational performance should trigger an FBA before reactive disciplinary measures are escalated.

As part of an initial or reevaluation: If behavior is a suspected area of disability-related need, the initial evaluation must include behavioral assessment. Failing to evaluate in all areas of suspected disability is a violation of Washington's evaluation requirements.

What a Proper FBA Should Include

A meaningful FBA is not a checklist. It requires:

• Operational definitions: The targeted behavior must be defined specifically enough that two different observers would record it consistently. "Aggression" is not a definition; "strikes a peer with an open hand when transitioning between activities" is.
• Antecedent analysis: What consistently happens before the behavior? What setting events or triggers are present?
• Consequence analysis: What happens immediately after the behavior? Does the student get what they appeared to want?
• Function hypothesis: A clear statement of why the behavior is occurring, grounded in the data collected.
• Baseline data: Frequency, duration, or intensity of the behavior before intervention begins, so progress can be measured.

If the FBA the district provides is a one-page observation form with vague language and no hypothesis, request a more comprehensive evaluation. You have the right under WAC 392-172A to disagree with the evaluation and request an IEE.

The Connection Between FBA and BIP

An FBA without a Behavior Intervention Plan is incomplete. The BIP uses the function hypothesis from the FBA to:

1. Identify replacement behaviors — alternative ways the student can meet the same need appropriately.
2. Describe antecedent modifications — changes to the environment or instruction that reduce the likelihood the triggering condition occurs.
3. Specify reinforcement strategies that support the replacement behavior.
4. Define how staff will respond when the problem behavior occurs (consequence strategies that do not inadvertently reinforce it).

A BIP built on an accurate FBA targets the function of the behavior, not just its surface appearance. A student who hits to escape difficult work needs a BIP that teaches them to request breaks appropriately — not one that escalates consequences for hitting, which misses the function entirely.

Requesting an FBA as a Parent

You can request an FBA as part of a special education evaluation or reevaluation. Submit the request in writing to the special education director. Under WAC 392-172A timelines, the district has 25 school days to respond to your referral with a Prior Written Notice agreeing or refusing to evaluate, and 35 school days from signed consent to complete the evaluation.

If the district refuses to conduct an FBA, they must provide a PWN explaining why. That documentation is important — if the refusal results in continued behavior escalations, the paper trail supports a future OSPI complaint.

OSPI's Shift Toward Positive Behavioral Supports

Washington's current guidance under OSPI's inclusive practices initiative emphasizes Positive Behavioral Interventions and Supports (PBIS) and moves away from punitive, reactive discipline. OSPI data shows that students with intellectual or developmental disabilities and Black students with disabilities are disproportionately placed in restrictive settings — often triggered by behavioral crises that an accurate FBA and effective BIP could have prevented.

If your child is being discussed for a more restrictive placement because of behavior, an FBA should occur before that placement decision is made, not after. Placement changes require Prior Written Notice and can be disputed through the same dispute resolution process as any other IEP decision.

The Washington IEP & 504 Blueprint covers how to request an FBA in writing, what to look for in a BIP, and how to challenge a placement decision made on the basis of behavior that was never properly assessed.

See more United States homeschool guides →