The RBT exam is organized into six domains, and every question on the exam comes from one of them. In January 2026, the BACB updated the document that defines these domains, changing its name from “Task List” to “Test Content Outline” (3rd Edition) and renaming four of the six domains.
If you are studying for the RBT exam in 2026, this guide tells you exactly what each domain covers, how much weight it carries, and where to spend your study time.
What Is the RBT Test Content Outline?
The Test Content Outline (TCO) is the official blueprint the BACB uses to write RBT exam questions. Every topic on the exam appears somewhere in this document, which makes it the single most important study resource available to you.
The 3rd Edition TCO took effect on January 1, 2026. It still has six domains, but four have been renamed to better reflect what RBTs actually do on the job. Eight new tasks were added and four were removed. You can download the official PDF for free at bacb.com.
The Six RBT Exam Domains
Domain 1: Data Collection and Graphing
This domain covers how RBTs measure behavior and record what they observe during sessions. Data collection is one of the most frequent hands-on tasks in ABA work, so this domain shows up consistently on the exam.
Key concepts include continuous measurement procedures (frequency, duration, latency, inter-response time), discontinuous measurement procedures (partial interval, whole interval, momentary time sampling), and permanent product recording. You also need to know how to prepare for data collection and how to update graphs with session data.
Study tip: Know the difference between each measurement type and be able to identify which one fits a specific scenario.
Domain 2: Behavior Assessment
This is the smallest domain on the exam at approximately 8% of scored questions. RBTs support assessments rather than design them, so the content here is narrower than other domains.
Key concepts include conducting preference assessments (such as free operant, paired stimulus, and multiple stimulus without replacement), assisting with indirect assessments, and conducting direct observation to collect behavioral data for the BCBA.
Domain 3: Behavior Acquisition
This is the largest domain on the exam, carrying approximately 32% of scored questions. If you only have limited study time, this is where to spend it.
Behavior Acquisition covers the strategies RBTs use to teach new skills to clients. Questions in this domain are almost always scenario-based, asking you to identify the correct teaching procedure for a given situation.
Key concepts include discrete trial training (DTT), naturalistic environment training (NET), prompting types and prompt fading hierarchies, shaping, chaining, and reinforcement schedules.
Study tip: Spend extra time on prompting hierarchies and the difference between least-to-most and most-to-least prompting — these distinctions come up frequently in scenario questions.
Domain 4: Behavior Reduction
This domain covers strategies for decreasing challenging or interfering behaviors. It carries approximately 18% of exam weight, making it the second most heavily tested domain.
Key concepts include extinction, the different types of differential reinforcement (DRA, DRI, DRO, DRL), antecedent modifications, and implementing crisis or safety procedures per an existing behavior plan.
Study tip: Know the difference between each differential reinforcement type by reading scenarios carefully. The distinctions between DRA, DRI, and DRO are a common source of confusion and a frequent exam question.
Domain 5: Documentation and Reporting
This domain focuses on the professional responsibilities RBTs have around recording session information and communicating with their supervising BCBA.
Key concepts include writing accurate session notes, completing incident reports, maintaining client confidentiality per HIPAA, reporting observations or concerns to supervisors in a timely manner, and understanding what falls within an RBT’s scope of practice versus what must be escalated.
Domain 6: Ethics in ABA
Ethics carries approximately 16% of exam weight and is the domain most often underestimated by candidates who assume it is “common sense.”
The ethics domain is now fully task-based in the 3rd Edition TCO. Key concepts include avoiding dual relationships, communicating with and deferring to your BCBA supervisor, maintaining client dignity throughout every session, knowing your scope of practice, maintaining confidentiality, and following BACB ethical guidelines.
Ethics questions are strict. Read every question carefully because a single detail often changes the correct answer.
How the 2026 Update Changed Things
- Four domain names were updated to better reflect RBT job duties
- Eight new tasks were added across multiple domains
- Four tasks were removed
- Ethics moved from a general section to a fully task-based domain
- RBT training requirements expanded to 54 curriculum topics across 8 areas
- Exam format unchanged: 85 questions (75 scored), 90-minute limit, passing score scaled 200/250
How to Use This for Your Study Plan
Start with Behavior Acquisition (Domain 3) since it carries the most exam points. Follow with Behavior Reduction (Domain 4). Then study Ethics (Domain 6) carefully — most people underestimate how specific and rule-based these questions are.
Fill in Data Collection (Domain 1), Documentation (Domain 5), and Behavior Assessment (Domain 2) in that order. Use the official BACB Test Content Outline PDF as a checklist and make sure you can explain every task item in your own words before exam day.
Frequently Asked Questions
Has the RBT Task List changed for 2026?
Yas. The BACB released the 3rd Edition Test Content Outline effective January 1, 2026. Four domains were renamed, 8 tasks were added, and 4 were removed. The exam format stayed the same.
Which RBT domain has the most exam questions?
Behavior Acquisition carries the highest weight at approximately 32% of scored questions.
Is the 2nd Edition Task List still valid?
No. As of January 1, 2026, the 3rd Edition TCO is the active exam blueprint. If your study materials reference the 2nd Edition, they are outdated.
Start practicing by domain. Try a free RBT practice exam at emmajchapman.com and identify which domains need more attention.
Related reading: How to Pass the RBT Exam on Your First Try | How Many Questions Are on the RBT Exam?