A teacher says, "He just refuses to work." Another says, "She only does it in the afternoon." A third says, "It gets worse when we change the schedule." Each is describing the same student, and each is holding one piece. An FBA is how a team puts the pieces on one table.
This guide explains what an FBA is, what it contains, what it cannot do, and where IDEA says it comes into play.
The short definition
A functional behavior assessment is a process for gathering information about a behavior, mainly where and when it happens and what seems to keep it going, so that a plan can be built around the reason for it. Illinois's guidance puts it this way: an FBA aims to analyze problematic behavior and identify situations where it is most likely to occur, and it is designed to help teams develop a behavioral intervention plan whose positive interventions address the behavior's function.
The word that matters is "function." Queensland's guide says the function of a behavior is its purpose, and that the function can be either to access something or to avoid something. A student who gets up and wanders during math may be avoiding the work. A student who calls out may be getting peer attention. The same behavior can serve different functions for different students.
What IDEA says
IDEA uses the term in its discipline rules. Section 300.530(d)(1)(ii) says a child removed from the current placement should receive, as appropriate, a functional behavioral assessment and behavioral intervention services designed to address the behavior violation so that it does not recur. Section 300.530(f) says that when conduct is found to be a manifestation of the child's disability, the IEP team must conduct an FBA, unless one was done before the behavior occurred, and implement a behavioral intervention plan, or review and modify an existing one.
Outside discipline, the rule does not require an FBA for every behavior. Section 300.324(a)(2)(i) asks the IEP team to consider positive behavioral interventions and supports, and other strategies, for a child whose behavior impedes the child's learning or that of others. For when an FBA is the right tool, see when is an FBA needed.
What goes into one
The federal rule does not list parts, so the best guide is a state's description. Illinois's guidance lists components for an FBA.
| Component | In plain words |
|---|---|
| Strengths | What the student does well, including appropriate behavior |
| Target behavior | The behavior of concern, defined so it can be observed and measured |
| Settings | Where it happens most and least, with data on intensity, frequency, and duration |
| Antecedents and consequences | What comes before and after |
| Other variables | Medication, medical conditions, sleep, diet, schedule, weather, and social factors |
| Function | The communicative or practical purpose the behavior seems to serve |
| Environmental changes already tried | What has been adjusted so far |
| Alternative behaviors | Skills that could serve the same purpose |
The guidance adds that direct observation should occur across settings and situations, that informal tools such as rating scales and interviews can add to it, and that an FBA should identify earlier interventions and how well they worked.
The steps, in outline
Queensland's guide describes the major steps: identify and prioritize the problem behavior, collect baseline data, review records, interview parents, teachers, and the student, observe directly, and summarize the information into a hypothesis. The details are in FBA steps in order.
Where the information comes from
Illinois's guidance says an FBA consists of direct and indirect data collection to find out where, when, and why a behavior occurs. Queensland's guide gives examples of each kind.
| Kind | Examples |
|---|---|
| Records | Report cards, test results, attendance, behavior referrals, earlier plans |
| Interviews | Parents, teachers, the student, and other staff who know the student |
| Observation | Watching in the setting where the behavior occurs, with a tally or an ABC form |
| Existing data | Counts a teacher already keeps, such as a daily tally |
Queensland adds that observation is not always needed. It is for when records and interviews are not enough, or the team is not confident it has identified the function. That is a useful reminder that an FBA can be proportionate: a small, clear problem may need a short process, and a complex one a longer process.
Who takes part
Illinois's guidance names school administration, school-based clinicians such as school psychologists and social workers, classroom teachers, board certified behavior analysts, parents or guardians, the student, and others who regularly interact with the student. It notes that written consent to exchange information can allow outside experts, such as a private therapist, to be consulted. Families are partners, not just a signature. They often know about setting events, such as a rough morning, that staff never see.
What an FBA is not
- Not a diagnosis. It describes behavior in context. It does not name a condition.
- Not a punishment step. Colorado's guide frames an FBA as a way to evaluate a child's behavioral needs and inform positive supports.
- Not finished at the report. Queensland's guide says completion of the FBA is not an end in itself. The next step is selecting interventions that match the function.
- Not a certainty. A function is a best guess. Queensland says a hypothesis is reached only after seeing repeated patterns, and that more than one function is possible.
A worked sketch
An invented example. A student leaves her seat several times during independent reading. Records show it began after a schedule change. Teacher interviews say it happens mostly when the text is long. Observations over a week show eight departures, all during independent reading, and in six the teacher walked over and quietly offered help. The team writes a hypothesis: during independent reading with long text, she leaves her seat, and adult help follows, so the function may be to get adult help or avoid the text. They plan to test it by teaching her to ask for help with a card. See hypothesis statement examples for how to word it.
Four questions for the first meeting
Before any data are collected, a team can save weeks by agreeing on four things. Which behavior comes first, and how will we describe it? Who will collect which information, and by when? What has already been tried, and what happened? When will we meet again to look at what we have? Writing the answers on one page gives the process a spine, and it helps a family see what to expect.
What this guide does not settle
Whether you need an FBA, who must consent, how long it may take, and what form to use are set by your state and district. Colorado's guide and Illinois's guidance are examples, and other states differ. Ask your special education director which procedure your district follows. Terms are in the glossary.