All 9 domains
104 official task statements
210–285 hrs suggested study
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Domain 01
5%
The smallest BCBA section at 8 scored questions, yet it supplies the vocabulary and reasoning style that the other 167 scored items assume: lawful behavior, parsimonious explanation and the seven dimensions of applied work.
Inside this domain
- Identify the goals of behavior analysis as a science (i.e., description, prediction, control).
- Explain the philosophical assumptions underlying the science of behavior analysis (e.g., selectionism, determinism, empiricism, parsimony, pragmatism).
- Explain behavior from the perspective of radical behaviorism.
- Distinguish among behaviorism, the experimental analysis of behavior, applied behavior analysis, and professional practice guided by the science of behavior analysis.
- and 1 more task statements
Watch for Correlation called control
- Task statements
- 5
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Domain 02
14%
Tied for the largest BCBA section with 24 scored questions and the longest list of task statements, covering the principles every assessment, intervention and supervision item relies on.
Inside this domain
- Identify and distinguish among behavior, response, and response class.
- Identify and distinguish between stimulus and stimulus class.
- Identify and distinguish between respondent and operant conditioning.
- Identify and distinguish between positive and negative reinforcement contingencies.
- and 20 more task statements
Watch for Unpleasant stimulus means punishment
- Task statements
- 24
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Domain 03
12%
Twenty-one scored questions on defining, measuring, graphing and reading behavior data. Choosing a measurement system that gives representative data is the thread running through all 12 task statements.
Inside this domain
- Create operational definitions of behavior.
- Distinguish among direct, indirect, and product measures of behavior.
- Measure occurrence.
- Measure temporal dimensions of behavior (e.g., duration, latency, interresponse time).
- and 8 more task statements
Watch for Most precise method wins
- Task statements
- 12
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Domain 04
7%
Thirteen scored questions on how behavior analysts show that an intervention caused a change, from baseline logic to choosing among reversal, multiple-baseline, multielement and changing-criterion designs.
Inside this domain
- Distinguish between dependent and independent variables.
- Distinguish between internal and external validity.
- Identify threats to internal validity (e.g., history, maturation).
- Identify the defining features of single-case experimental designs (e.g., individuals serve as their own controls, repeated measures, prediction, verification, replication).
- and 5 more task statements
Watch for Reversal for dangerous behavior
- Task statements
- 9
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Domain 05
13%
Twenty-two scored questions apply the Ethics Code for Behavior Analysts to everyday dilemmas: confidentiality, social media, multiple relationships, transitions, licensure and culturally responsive practice.
Inside this domain
- Identify and apply core principles underlying the ethics codes for BACB certificants (e.g., benefit others; treat others with compassion, dignity, and respect; behave with integrity).
- Identify the risks to oneself, others, and the profession as a result of engaging in unethical behavior.
- Develop and maintain competence by engaging in professional development activities (e.g., read literature, seek consultation, establish mentors).
- Identify and comply with requirements for collecting, using, protecting, and disclosing confidential information.
- and 8 more task statements
Watch for Report first
- Task statements
- 12
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Domain 06
13%
Twenty-three scored questions on gathering and interpreting assessment information: records, cultural variables, skills, preferences, descriptive data and functional analysis, ending with goal selection.
Inside this domain
- Identify relevant sources of information in records (e.g., educational, medical, historical) at the outset of the case.
- Identify and integrate relevant cultural variables in the assessment process.
- Design and evaluate assessments of relevant skill strengths and areas of need.
- Design and evaluate preference assessments.
- and 4 more task statements
Watch for ABC data shows function
- Task statements
- 8
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Domain 07
14%
The largest BCBA section at 25 scored questions and 19 task statements, covering the procedures behavior analysts use to teach new skills and reduce behavior that harms the client or limits access to reinforcement.
Inside this domain
- Design and evaluate positive and negative reinforcement procedures.
- Design and evaluate differential reinforcement (e.g., DRA, DRO, DRL, DRH) procedures with and without extinction.
- Design and evaluate time-based reinforcement (e.g., fixed-time) schedules.
- Identify procedures to establish and use conditioned reinforcers (e.g., token economies).
- and 15 more task statements
Watch for Time-out for escape
- Task statements
- 19
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Domain 08
11%
Twenty scored questions on turning assessment results into workable plans: writing goals, choosing interventions that fit, planning for side effects and relapse, and using data to adjust.
Inside this domain
- Develop intervention goals in observable and measurable terms.
- Identify and recommend interventions based on assessment results, scientific evidence, client preferences, and contextual fit (e.g., expertise required for implementation, cultural variables, environmental resources).
- Select socially valid alternative behavior to be established or increased when a target behavior is to be decreased.
- Plan for and attempt to mitigate possible unwanted effects when using reinforcement, extinction, and punishment procedures.
- and 4 more task statements
Watch for Most intensive is best
- Task statements
- 8
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Domain 09
11%
Nineteen scored questions on supervising and managing the people who deliver services, from contracts and equitable practice to behavioral skills training and function-based performance diagnostics.
Inside this domain
- Identify the benefits of using behavior-analytic supervision (e.g., improved client outcomes, improved staff performance and retention).
- Identify and apply strategies for establishing effective supervisory relationships (e.g., executing supervisor-supervisee contracts, establishing clear expectations, giving and accepting feedback).
- Identify and implement methods that promote equity in supervision practices.
- Select supervision goals based on an assessment of the supervisee's skills, cultural variables, and the environment.
- and 3 more task statements
Watch for Retrain by default
- Task statements
- 7
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Domain names, weights and task statements come from Behavior Analyst Certification Board's official outline (BCBA Test Content Outline, 6th ed. (updated 09/2024; applies to examinations from 2025, current)). Question counts and study hours are editorial planning estimates, not official figures. Last reviewed October 2026.