Domain D
BCBA Domain D

Experimental Design

Study hub for Domain D with scenario questions, concept guides, review priorities, and common distractor traps.

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Public questions37
Concept guides2
Scored-question weight13

How to study this domain

  1. 1Focus on single-case experimental design logic, demonstrations of control, and threats to validity.
  2. 2When reviewing missed items, identify what comparison or replication is needed to support a functional relation.
  3. 3Watch for distractors that involve treating improvement alone as proof of experimental control.
Practice this domain nowReview missed items

High-priority concepts

high

Single-case design selection

Select a design based on reversibility, safety, behavior-change trajectory, and the need for replication.

Practice questions in this domain

Start drillAll questions
bcba-006Identify when reversal design is inappropriate.Experimental Design, Ethics, Irreversibilitybcba-011Select a multiple-baseline design when reversal is unsafe or impractical.Multiple Baseline, Experimental Design, Safetybcba-165Select a multiple-baseline design when reversal is inappropriate.Multiple Baseline, Experimental Design, Reversal Designbcba-166Identify threats to internal validity in weak designs.Internal Validity, Experimental Control, Changing Criterionbcba-167Select a multiple-baseline design when reversal is inappropriate.Multiple Baseline, Experimental Design, Alternating Treatmentsbcba-168Identify threats to internal validity in weak designs.Internal Validity, Experimental Control, Internal Validitybcba-169Select a multiple-baseline design when reversal is inappropriate.Multiple Baseline, Experimental Design, Reversal Designbcba-170Identify threats to internal validity in weak designs.Internal Validity, Experimental Control, Changing Criterion

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.