BCBA 6th Edition Test Content Outline: Complete Domain-by-Domain Breakdown (2025–2026)

AI-assisted draft; reviewed and edited by Rob Spain, BCBA, IBA. All exam structure information is sourced directly from the BACB's published 6th Edition Test Content Outline and Task List, available at bacb.com. Domain weight estimates reflect task count distribution and are not official BACB-published percentages.

If you're preparing for the BCBA exam, you're studying the 6th Edition Test Content Outline (TCO) — and knowing exactly what's on it, how it's weighted, and which domains eat the most exam questions is the difference between a focused study plan and wasted hours.

This guide breaks down every domain of the BCBA 6th Edition TCO, gives you the exam weights, tells you which tasks are highest-yield, and flags which sections catch school-based BCBAs off guard.

Download the official source: BCBA 6th Edition Task List & Test Content Outline (BACB.com) — free PDF directly from BACB.

Quick fact: The BCBA exam contains 175 scored questions plus 10 unscored pilot questions (185 total). The 6th Edition TCO organizes those questions across 9 domains with 104 total tasks.

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What Changed from the 5th Edition Task List?

The BACB retired the 5th Edition Task List when they released the 6th Edition Test Content Outline (TCO) — which became the basis for all BCBA exams beginning in 2025. Here's what's different:

• Domains reorganized: The 5th edition had 5 content areas (A–E). The 6th edition has 9 domains (A–I), creating a more granular structure.
• Cultural responsiveness added: Domain I is entirely new — it explicitly tests competencies around diversity, equity, and inclusion in behavior analysis practice.
• Ethics integrated: Rather than a standalone section, ethics is woven throughout and also has its own domain (E).
• "Foundational" vs. "Applied" structure: The 6th edition distinguishes between conceptual foundations (early domains) and applied practice (later domains).
• Increased real-world scenarios: Questions are more applied and scenario-based rather than definition-heavy.

For a detailed comparison of 5th vs. 6th edition structure, see the BACB's published TCO at bacb.com.

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The 9 Domains of the BCBA 6th Edition TCO

The BACB does not publish exact question-by-question percentages for each domain publicly, but based on the task distribution (104 tasks across 9 domains) and candidate reports, the following represents the domain structure and relative weight on the exam.

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Domain A: Behaviorism and Philosophical Foundations

Task count: ~8 tasks | Exam weight: ~8–10%

This domain covers the philosophical and theoretical bedrock of behavior analysis — the "why" behind the science.

Key tasks include:

• Identify the goals of behavior analysis as a science (description, prediction, control)
• Explain the assumptions of behavior analysis (determinism, empiricism, parsimony, philosophical doubt)
• Distinguish between mentalistic and behavioral explanations of behavior
• Identify and explain the core principles of radical behaviorism
• Differentiate between respondent and operant conditioning

School BCBA angle: When writing behavioral definitions in IEPs or FBAs, this domain reminds you why observable/measurable behavior is required — not "bad attitude" or "ADHD moment."

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Domain B: Concepts and Principles

Task count: ~10 tasks | Exam weight: ~10–12%

The largest conceptual domain — this is where reinforcement, punishment, extinction, and related principles live.

Key tasks include:

• Define and provide examples of positive and negative reinforcement
• Distinguish among positive punishment, negative punishment, and extinction
• Define unconditioned and conditioned reinforcers/punishers
• Explain stimulus control and discrimination
• Define schedules of reinforcement and their behavioral effects
• Explain behavioral momentum and resurgence

High-yield: Schedules of reinforcement (VI, VR, FI, FR) and their characteristic response patterns come up consistently in candidate reports. Know the scallop pattern, the post-reinforcement pause, and which schedules are most resistant to extinction.

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Domain C: Measurement

Task count: ~11 tasks | Exam weight: ~10–12%

Measurement is one of the most applied domains and often underestimated by candidates. This is where data systems live.

Key tasks include:

• Define and distinguish among frequency, rate, duration, latency, interresponse time (IRT), and percent occurrence
• Select and implement appropriate measurement procedures based on the target behavior
• Evaluate the quality of behavioral data (accuracy, reliability, validity)
• Calculate and interpret IOA (interobserver agreement)
• Define and use continuous vs. discontinuous measurement

School BCBA angle: Data sheets, ABC recording, scatter plots, frequency counts for IEP goals — all of this anchors in Domain C. If you're building your exam prep, measurement should be a priority; it's both testable and immediately applicable.

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Domain D: Experimental Design

Task count: ~6 tasks | Exam weight: ~5–7%

Lighter on exam weight but requires conceptual precision. This covers single-case design, internal validity, and research interpretation.

Key tasks include:

• Distinguish between internal and external validity threats
• Identify and explain single-subject research designs (reversal/ABAB, multiple baseline, alternating treatments, changing criterion)
• Evaluate the appropriate use of each design type
• Interpret graphed data from single-case studies

What to know: The exam rarely asks you to design a study from scratch. Expect scenario questions: "A researcher wants to minimize carryover effects — which design is most appropriate?"

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Domain E: Ethics

Task count: ~11 tasks | Exam weight: ~12–15%

Ethics is the second-largest domain by task count and has become increasingly weighted. Do not underweight this.

Key tasks include:

• Apply the BACB Ethics Code in scenarios involving dual relationships, conflicts of interest, and boundary violations
• Identify scope-of-practice boundaries for BCBAs
• Apply requirements for supervisory relationships and documentation
• Identify ethical obligations around documentation, record-keeping, and data privacy
• Apply the decision-making framework for ethical dilemmas

Top traps:

• Dual relationships: the Code doesn't say "never" — it says avoid when harmful or exploitative
• Confidentiality and mandated reporting: know when you must disclose
• Supervisory ethics: what documentation is required, how supervision must be structured

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Domain F: Behavior Assessment

Task count: ~10 tasks | Exam weight: ~10–11%

This is where FBAs, preference assessments, and skill assessments live. Extremely applied, high relevance for school BCBAs.

Key tasks include:

• Conduct indirect and descriptive FBA methods (interviews, scatter plots, ABC data)
• Design and conduct functional analyses (analog, naturalistic, brief)
• Select, administer, and interpret preference assessments (MSWO, paired stimulus, free operant)
• Conduct skill assessments (VB-MAPP, AFLS, ABLLS)
• Interpret assessment results to guide intervention

School BCBA angle: The FBA → function → BIP chain is your daily workflow. This domain directly transfers to practice. If you're a working school BCBA, you have an advantage here — use it.

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Domain G: Behavior-Change Procedures

Task count: ~22 tasks | Exam weight: ~20–25%

The largest domain by task count. This is the "what do you do about it" domain — the heart of applied behavior analysis practice.

Key tasks include:

• Implement reinforcement-based interventions (DRI, DRO, DRA, DRL)
• Use extinction appropriately, including managing extinction bursts
• Apply punishment procedures (Type I and Type II) within ethical guidelines
• Implement antecedent modifications (prompting, prompt fading, chaining, shaping)
• Apply stimulus control procedures
• Use self-management and self-monitoring strategies
• Implement generalization and maintenance procedures
• Apply Behavioral Skills Training (BST)
• Implement discrete trial training (DTT) and naturalistic teaching strategies
• Use functional communication training (FCT)

Study strategy: This domain has the most tasks and typically the most exam questions. Learn procedures within the function-based framework. "The behavior serves escape — which procedure directly addresses that?" Practice linking function → intervention choice.

High-yield for school BCBAs: FCT, DRA/DRI for function-based intervention, prompt hierarchies, and generalization programming.

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Domain H: Selecting and Implementing Interventions

Task count: ~9 tasks | Exam weight: ~8–10%

This domain bridges assessment to practice — how you select, plan, and implement behavior support.

Key tasks include:

• Prioritize target behaviors based on social significance and client needs
• Develop measurable behavior-change goals
• Adapt interventions to client characteristics and contextual variables
• Collaborate with stakeholders (families, teachers, school teams)
• Evaluate intervention effectiveness and make data-based decisions

School BCBA angle: Collaborating with teachers, adapting for classroom contexts, and fitting behavior support into MTSS/PBIS tiers — this domain is your daily work. Candidates with school experience often find this domain intuitive.

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Domain I: Personnel Supervision and Management

Task count: ~7 tasks | Exam weight: ~7–9%

Added emphasis in the 6th edition. This domain covers how BCBAs train, supervise, and support RBTs and other behavior technicians.

Key tasks include:

• Apply BACB supervisory requirements and documentation standards
• Use Behavioral Skills Training (BST) to train supervisees
• Provide performance feedback and monitor supervisee performance
• Design and implement staff training programs
• Monitor and support RBT competency

What to know: BST (instruction + modeling + rehearsal + feedback) appears across both Domain G and Domain I — know it inside and out. Also know the BACB's requirements for supervision documentation.

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Domain Weights at a Glance

Domain	Tasks	Estimated Exam Weight	Priority
A – Behaviorism & Philosophical Foundations	~8	8–10%	Medium
B – Concepts and Principles	~10	10–12%	High
C – Measurement	~11	10–12%	High
D – Experimental Design	~6	5–7%	Medium
E – Ethics	~11	12–15%	Very High
F – Behavior Assessment	~10	10–11%	High
G – Behavior-Change Procedures	~22	20–25%	Critical
H – Selecting & Implementing Interventions	~9	8–10%	High
I – Personnel Supervision & Management	~7	7–9%	Medium

Note: BACB does not publish exact percentage weights per domain. These estimates are based on task count distribution and widely reported candidate experiences. Treat all domains as testable.

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Which Domains Should You Study First?

Tier 1 — Study these first (highest yield):

• Domain G (Behavior-Change Procedures) — 20–25% of the exam
• Domain E (Ethics) — 12–15% and notorious for tricky scenarios
• Domain C (Measurement) — math-based, requires practice

Tier 2 — High importance, study concurrently:

• Domain B (Concepts and Principles) — foundational, high application
• Domain F (Behavior Assessment) — very applied, FBA/FA questions
• Domain H (Selecting and Implementing Interventions) — applied decision-making

Tier 3 — Don't skip, but proportional study:

• Domain A (Behaviorism) — conceptual, sets the frame
• Domain I (Supervision) — growing emphasis in the 6th edition
• Domain D (Experimental Design) — lower weight, but precision matters

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What This Means for School-Based BCBAs

If you work in schools, you have an advantage on the BCBA exam — and some blind spots.

Advantages:

• Domain F and Domain H mirror school-based practice
• Domain G's function-based procedures (FBA → FCT → DRA) are your daily workflow
• You see IEP goal development, team collaboration, and MTSS tiers in real life

Potential blind spots:

• Domain D (Experimental Design): school BCBAs rarely conduct single-subject research
• Domain E (Ethics): school settings create unique dual relationship and confidentiality challenges
• Domain B (Schedules of reinforcement): classroom practice is rarely as precise as the exam requires

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How to Use This Breakdown in Your Study Plan

1. Map your current knowledge to each domain. Take a diagnostic practice exam and score yourself by domain. Try our free BCBA practice exam — it tracks your performance by domain automatically.
2. Allocate study time by weight. Domain G deserves roughly 2.5x the study time of Domain D.
3. Study the Ethics Code directly. Don't rely on summaries — read the 2022 BACB Ethics Code. It's 30 pages and entirely testable.
4. Practice IOA calculations. Measurement (Domain C) has math questions. Do them with paper before exam day.
5. Do domain-specific practice questions. After studying each domain, hit practice questions targeting it specifically.

Ready to practice by domain? Behavior Study Tools generates unlimited domain-specific practice questions for the 6th Edition TCO — so you can drill Domain G until it sticks.

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Frequently Asked Questions

Is the BCBA exam still based on the 6th Edition TCO in 2026? Yes. The 6th Edition TCO is the current standard for BCBA and BCaBA exams. The BACB has not announced a 7th edition as of 2026.

How many questions are on the BCBA exam? 185 total (175 scored + 10 unscored pilot questions). You won't know which 10 are pilot.

What is the passing score for the BCBA exam? The BACB uses a scaled scoring system. A score of 400 on a scale of 0–500 is the passing threshold.

How long do I have to take the BCBA exam? 4 hours for the full exam.

What percentage of people pass the BCBA exam on the first try? Recent data shows approximately 54–65% of first-time candidates pass. Candidates who use structured study tools and domain-specific practice exams report higher first-attempt success rates.

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Summary

The BCBA 6th Edition Test Content Outline organizes 175 scored exam questions across 9 domains and 104 tasks. Domain G (Behavior-Change Procedures) carries the most weight at roughly 20–25% of the exam, followed by Ethics (12–15%) and Measurement (10–12%). For school-based BCBAs, the biggest hidden risks are Domain D (Experimental Design) and Domain E (Ethics) — both require deliberate study beyond everyday practice.

Next steps:

• Take a free BCBA practice exam by domain
• Read our BCBA exam prep study strategies guide
• Explore Behavior Study Tools for domain-specific practice

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Rob Spain is a Board Certified Behavior Analyst (BCBA) and International Behavior Analyst (IBA) with 25+ years of school-based practice. He is the founder of BehaviorSchool and Behavior Study Tools.

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Sources & References

• Behavior Analyst Certification Board. (2022). BCBA/BCaBA Task List (6th ed.) and Test Content Outline. BACB. https://www.bacb.com/bcba-bcaba-behavior-analyst-task-list/ ← Official 6th Edition Task List (download directly from BACB)
• Behavior Analyst Certification Board. (2022). Ethics Code for Behavior Analysts. BACB. https://www.bacb.com/ethics/ethics-code-for-behavior-analysts/
• Individuals with Disabilities Education Act, 20 U.S.C. § 1414 et seq. (2004).
• Behavior Analyst Certification Board. (2023). BCBA Examination Passing Scores and Pass Rates. BACB. https://www.bacb.com/bcba-exam-pass-rates/

Note: Exam domain weight percentages are estimates based on task count distribution across 9 domains (104 total tasks) and widely reported candidate experiences. The BACB does not publish official percentage weights per domain. Consult the official BACB Test Content Outline for authoritative exam structure information.