Building Mixed-Domain Practice Blocks
Key Takeaways
- Mixed-domain practice should reflect official TCO6 weight and the way real case items blend domains.
- Review errors by domain, task type, and decision error rather than by right or wrong only.
- Practice blocks should include assessment-to-intervention cases, ethics-in-context cases, graph decisions, and supervision scenarios.
- Timed review should train pacing, reading precision, and answer elimination without inventing raw passing-score targets.
Practice Like the Exam Blends Domains
The BCBA exam uses 185 multiple-choice questions, with 175 scored questions and 10 unscored pilot questions. Each item has 4 options and 1 correct answer. Build practice that reflects mixed decision making rather than studying one domain in isolation forever.
Use official TCO6 weights to decide how often each domain appears in review. Domain B and G each carry 14%. Domains E and F each carry 13%. Domain C carries 12%. Domains H and I each carry 11%. Domain D carries 7%, and Domain A carries 5%.
Mixed Block Template
| Block type | Items | Purpose |
|---|---|---|
| Concept-to-case | 10 | Apply Domain A/B terms to scenarios. |
| Measurement and graph | 10 | Link Domains C/D to visual decisions. |
| Assessment-to-treatment | 15 | Move from Domain F to G/H. |
| Ethics-in-context | 10 | Embed Domain E inside service decisions. |
| Supervision and integrity | 10 | Apply Domain I to staff performance and data use. |
| Cumulative review | 15 | Mix all domains under timed conditions. |
Error Log Fields
Track the missed item, domain, task, case clue, chosen distractor, correct rule, and next practice action. Add a tag for the error type: definition, function, measurement, design, ethics, procedure, contextual fit, supervision, or pacing.
Timing Practice
Because the official exam time is 4 hours total and includes preliminary screens, train steady pacing. Do not chase a fixed raw passing percentage. BACB reports pass/fail results and uses a modified Angoff method, so practice scores are tools for diagnosis, not official score predictions.
A candidate builds a 60-item mixed practice block. Which distribution best reflects official TCO6 emphasis while still allowing integration?
A candidate misses an item because they selected differential reinforcement before identifying the behavior's function. Which error-log tag is most useful?
During timed practice, a candidate tries to convert each score to an official raw passing percentage. What is the best correction?