Domain Weights at a Glance
* Domain weights are approximate and based on the BACB 3rd Edition RBT Task List. The actual number of scored questions is 75.
Domain A: Data Collection and Graphing
17% of the exam • ~13 questions
Key Topics
- Continuous measurement (frequency, rate, duration, latency, IRT)
- Discontinuous measurement (interval recording, time sampling)
- Permanent product recording
- Graphing data (line graphs, bar graphs)
- Calculating summary statistics (rate, mean, percentage)
- Identifying trends and patterns in graphed data
- Interobserver agreement (IOA)
📖 Study Strategy: Know when to use each measurement method. The exam loves scenario questions like "A BCBA wants to measure how long a tantrum lasts — which method should you use?" (Answer: duration recording). Practice reading graphs and identifying trends.
⚠️ï¸ Common Mistake: Confusing inter-response time (IRT) with latency. IRT is the time between two consecutive responses; latency is the time between a stimulus and the start of a response.
Domain B: Behavior Assessment
11% of the exam • ~8 questions
Key Topics
- Assisting with functional assessments
- Identifying the four functions of behavior (SEAT)
- Describing antecedents and consequences
- Preference assessments (MSWO, paired, free operant)
- Descriptive assessments (ABC data)
📖 Study Strategy: Memorize the four functions of behavior: Social attention, Escape/avoidance, Access to tangibles, and auTomatic/sensory (SEAT). Know the difference between indirect, descriptive, and experimental functional assessments.
⚠️ï¸ Common Mistake: Thinking the RBT conducts functional analyses independently. RBTs assist with data collection but BCBAs design and oversee formal FAs.
Domain C: Behavior Acquisition
25% of the exam • ~19 questions
Key Topics
- Implementing reinforcement procedures
- Discrete trial training (DTT)
- Naturalistic teaching (NET)
- Task analysis and chaining (forward, backward, total task)
- Shaping
- Prompting and prompt fading
- Discrimination training
- Generalization and maintenance
📖 Study Strategy: This is the BIGGEST domain — roughly 19 questions (25%). Master the difference between forward chaining, backward chaining, and total task presentation. Know your prompt hierarchy: full physical → partial physical → model → gestural → verbal → independent.
⚠️ï¸ Common Mistake: Confusing errorless learning with trial-and-error teaching. Errorless learning starts with the most intrusive prompt to prevent errors, then systematically fades.
Domain D: Behavior Reduction
19% of the exam • ~14 questions
Key Topics
- Function-based behavior reduction procedures
- Differential reinforcement (DRA, DRI, DRO, DRL)
- Extinction procedures
- Reinforcement and punishment procedures
- Antecedent modifications
- Crisis intervention
📖 Study Strategy: The key principle: all behavior reduction should be function-based. Memorize the four functions of behavior and which interventions match each function. This is the second-heaviest domain at 19%.
⚠️ï¸ Common Mistake: Recommending punishment-based interventions. The exam strongly favors reinforcement-based approaches. When given a choice between punishment and reinforcement, always lean toward reinforcement.
Domain E: Documentation and Reporting
13% of the exam • ~10 questions
Key Topics
- Documenting services accurately
- Preparing session notes
- Communicating with supervisors
- Reporting changes in client behavior
- Objective vs. subjective language
- Record keeping requirements
📖 Study Strategy: Use objective, measurable language in all documentation. Instead of "Johnny had a bad day," write "Johnny engaged in 12 instances of aggression during the 2-hour session."
⚠️ï¸ Common Mistake: Using subjective language on the exam. If an answer option includes words like "seems," "appears to feel," or "was in a bad mood," it's almost always wrong.
Domain F: Ethics
15% of the exam • ~11 questions
Key Topics
- Following the RBT Ethics Code
- Maintaining professional boundaries
- Confidentiality
- Cultural humility
- Responding to feedback
- Scope of practice
- Mandated reporting
📖 Study Strategy: The golden rule: the RBT always defers to the BCBA. If you're unsure about an ethics question, pick the answer that involves "consult your supervisor." This domain covers 15% of the exam.
⚠️ï¸ Common Mistake: Thinking the RBT can modify a behavior plan. RBTs implement plans designed by BCBAs — they do not change, adjust, or create behavior intervention plans independently.
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