BCBA Domain D
Experimental Design
Study hub for Domain D with scenario questions, concept guides, review priorities, and common distractor traps.
Domain D review facts
A concise summary for candidates, search engines, and answer engines.
What this domain covers
single-case experimental design logic, demonstrations of control, and threats to validity
How to practice it
identify what comparison or replication is needed to support a functional relation
Common wrong-answer pattern
treating improvement alone as proof of experimental control
How to study this domain
- 1Focus on single-case experimental design logic, demonstrations of control, and threats to validity.
- 2When reviewing missed items, identify what comparison or replication is needed to support a functional relation.
- 3Watch for distractors that involve treating improvement alone as proof of experimental control.
When this domain is the weak area
What the miss usually looks like
you treat a behavior change as evidence without checking comparison, replication, or control
What to do before more random practice
name what demonstration of control is missing before accepting a causal claim
Then drill this domain deliberately
Answer 5-8 related prompts, explain the key clue before reading the explanation, and stop if the same trap repeats twice.
High-priority concepts
Practice questions in this domain
bcba-042Dependent and independent variables: Internal validity and confounds.Internal validity and confounds, Dependent and independent variables, confounding variablesbcba-043Internal and external validity: Measurement quality and procedural integrity.Measurement quality and procedural integrity, Internal and external validity, validitybcba-044Threats to internal validity: Measurement quality and procedural integrity.Measurement quality and procedural integrity, Threats to internal validity, validitybcba-045Defining features of single-case experimental designs: Single-case design selection.Single-case design selection, Defining features of single-case experimental designs, reversal designbcba-046Single-case versus group-design strengths: Internal validity and confounds.Internal validity and confounds, Single-case versus group-design strengths, confounding variablesbcba-047Single-case design data critique and interpretation: Visual analysis and data-based decisions.Visual analysis and data-based decisions, Single-case design data critique and interpretation, levelbcba-048Reversal, multiple-baseline, multielement, and changing-criterion designs: Single-case design selection.Single-case design selection, Reversal, multiple-baseline, multielement, and changing-criterion designs, reversal designbcba-049Comparative, component, and parametric analysis rationales: Single-case design selection.Single-case design selection, Comparative, component, and parametric analysis rationales, reversal design
Related study guides
GuideScenario distractor patternsUse this guide to spot answers that sound behavior analytic but skip the scenario constraint.GuideHow to review missed questionsUse this after domain drills to turn misses into correction rules.GuideMock exam vs practice questionsUse this to decide whether the next step should be targeted drilling or timed practice.
Domain FAQ
What does BCBA Domain D cover?
Domain D, Experimental Design, focuses on single-case experimental design logic, demonstrations of control, and threats to validity.
How should I study Domain D practice questions?
For this domain, identify what comparison or replication is needed to support a functional relation. Review the explanation and wrong-choice notes after each scenario.
What is a common trap in Domain D questions?
A common distractor pattern is treating improvement alone as proof of experimental control.
Editorial transparency
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