Master every FBA method — when to use each, the rigor hierarchy, FA conditions, and the four behavioral functions the exam tests.
An FBA identifies the function — the maintaining reinforcer — of a problem behavior. The method chosen determines the rigor of the conclusion. Only one method establishes a true functional relationship.
Gather information through interviews, rating scales, and questionnaires — without directly observing the behavior.
Direct observation of the behavior in the natural environment without experimental manipulation.
Experimental manipulation of antecedents and consequences to identify which variables control the behavior.
Every problem behavior is maintained by one (or more) of four functions. FBA identifies which one applies.
Understanding the mechanics of each method — not just the names — is what the BCBA exam tests.
Indirect tools gather second-hand information about the behavior. They are fast and low-cost but depend entirely on the accuracy of informant memory and interpretation.
Structured interview (O'Neill et al.) with caregivers and teachers. Covers setting events, antecedents, consequences, and perceived function. Most comprehensive indirect tool.
16-item rating scale (Durand & Crimmins). Caregivers rate behavioral descriptions. Produces scores across 4 functions: sensory, escape, attention, tangible.
25-item rating scale (Paclawskyj et al.). Scored across 5 subscales: attention, escape, non-social (automatic), physical, and tangible.
27-item checklist. Brief, efficient screener used early in the assessment process. Less comprehensive than FAI or MAS.
Direct observation without manipulating variables. Captures naturally occurring patterns in the environment.
Record every instance of behavior with the Antecedent, Behavior (topography/intensity), and Consequence. Reveals patterns: what precedes and follows the behavior consistently.
Grid showing behavior frequency across time blocks (e.g., 30-min intervals) and days. Identifies temporal patterns — when the behavior most likely occurs. Useful for identifying setting events and activity variables.
Free-form written account of behavior and context. Less structured; useful for generating initial hypotheses when no standardized format is yet established.
Pre-coded recording forms with predetermined antecedent and consequence categories. Increases inter-observer reliability compared to narrative recording.
Each condition manipulates a specific antecedent and consequence to test one hypothesis. Conditions are run in a multielement (alternating treatments) design. The condition producing the highest rate of behavior identifies the function.
Low-stimulation environment; preferred items available but therapist ignores the client. Therapist delivers brief social attention (contingent on behavior). No demands present.
Therapist presents a non-preferred task using a graduated guidance/prompt hierarchy. Behavior results in a brief break from the task (escape contingency). No attention delivered for behavior.
Preferred item is briefly taken away. Behavior results in return of the preferred item. Attention is neutral/minimal. Demand is absent.
Alone: No social interaction, no demands, no preferred items — tests whether behavior occurs without any social consequence (automatic).
Play/Control: Free access to preferred items + non-contingent attention + no demands. Lowest rates expected here if behavior is socially maintained.
Mechanism: Social positive reinforcement. Behavior is followed by delivery of social attention (verbal, physical, visual).
Even negative attention counts — a reprimand or a frustrated response can maintain attention-motivated behavior.
Extinction: Planned ignoring (withhold all social attention)
Mechanism: Social negative reinforcement. Behavior is followed by removal or postponement of demands, tasks, people, or aversive stimuli.
Avoidance: Behavior prevents the aversive from occurring (not just removes it).
Extinction: Escape extinction — block all escape; continue task
Mechanism: Social positive reinforcement. Behavior is followed by delivery of a preferred item or access to a preferred activity.
Social mediation required — another person must control access to the item.
Extinction: Withhold the tangible item following behavior
Mechanism: Not socially mediated. The behavior itself produces the reinforcing sensory consequence (positive or negative).
Occurs even when alone — no social contingency needed.
Extinction: Sensory extinction — block or mask the sensory consequence (hardest to implement)
Filter by method or browse all rows. Essential for "which FBA method?" scenario questions.
| Characteristic | Indirect Assessment | Descriptive Assessment | Functional Analysis |
|---|---|---|---|
| Data source | Caregiver / teacher report (interviews, rating scales) | Direct observation in natural environment | Controlled experimental conditions with manipulated variables |
| Rigor level | Lowest | Moderate | Highest Gold Standard |
| Can confirm function? | No — hypothesis only | No — correlation only | Yes — establishes causation |
| Direct observation required? | No | Yes — naturalistic | Yes — controlled conditions |
| Experimental manipulation? | No | No | Yes — defines the method |
| Time / effort required | Low — 30–60 min interview or rating scale | Moderate — multiple observation sessions | High — multiple sessions per condition, repeated |
| Risk of increasing behavior | None | Minimal — no manipulation | Possible — behavior is evoked and reinforced in conditions |
| Best use case | Initial hypothesis generation; history gathering; low-severity behaviors | Identifying patterns; ecologically valid data; supplement to indirect | Severe behavior; when indirect and descriptive are inconclusive; treatment-resistant behavior |
| Common tools / designs | FAI, MAS, QABF, FAST | ABC recording, scatter plot, narrative recording | Multielement (alternating treatments) design; standard Iwata conditions; brief FA; IISCA |
| Sensitivity to multiple functions | Limited — relies on informant perception | Moderate — patterns may reveal multiple antecedents | High — each condition tests a specific function independently |
Identify the method and the function from scenario descriptions — the most common exam format for FBA questions.
10 BCBA-style scenario questions — identify the FBA method, the function, or the appropriate next step.
Answer three questions to get a method recommendation for your clinical context.
Tap any card to flip it and reveal the mnemonic or critical rule.