By Matt Harrington, BCBA · Behaviorist Book Club · Clinical decision guide

Competing Stimulus Assessment vs. Stimulus Preference Assessment: When to Use Each

In This Guide

Side-by-Side Comparison
Clinical Decision Framework
Key Takeaways

One of the most consequential decisions a behavior analyst makes is not just what intervention to use, but how to approach the clinical question in the first place. For competing stimulus assessments: recent advances and applications, the difference between an evidence-based, individualized approach and a traditional, protocol-driven one can significantly impact outcomes.

This guide lays out the key factors side by side to support your clinical decision-making.

Side-by-Side Comparison

Factor	Evidence-Based Approach	Traditional Approach
Primary Clinical Question	Preference Assessment: What stimuli or activities does this individual prefer among available options?	Competing Stimulus Assessment: Which preferred stimuli produce measurable reductions in challenging behavior when freely available?
Measurement Focus	Preference Assessment: Approach behavior, selection frequency, engagement duration with each stimulus	Competing Stimulus Assessment: Rate of challenging behavior AND engagement with stimulus during same observation window
Treatment Relevance	Preference Assessment: Reinforcer identification for skill acquisition programs; DRO, DRA alternatives; activity selection	Competing Stimulus Assessment: NCR schedule component selection; treatment for automatically reinforced behavior; leisure programming
Sensitivity to Motivating Operations	Preference Assessment: MO affects results but is not systematically tested as part of the assessment	Competing Stimulus Assessment: MO state at time of assessment is critical; conducted when the MO for challenging behavior is relevant
Required Assessment Setting	Preference Assessment: Can be conducted in any controlled setting with appropriate materials; context flexibility is high	Competing Stimulus Assessment: Should be conducted in the context where challenging behavior typically occurs; ecological validity is essential
Sequencing in Assessment Battery	Preference Assessment: Conducted first — generates the pool of candidate stimuli for subsequent assessments	Competing Stimulus Assessment: Conducted after preference assessment — tests the competition value of high-preference stimuli identified earlier

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Clinical Decision Framework

Use this framework when approaching competing stimulus assessments: recent advances and applications in your practice:

Step 1: Is intervention warranted?

Does the data support a need for intervention? Is there a meaningful impact on the individual's quality of life, safety, or access to reinforcement?

YES → Proceed to assessment NO → Document reasoning, monitor

Step 2: Have you conducted an individualized assessment?

A functional assessment should guide intervention selection. Avoid defaulting to standard protocols without individual analysis. Consider environmental variables, setting events, and private events.

YES → Select evidence-based approach matched to function NO → Complete assessment first

Step 3: Is the individual/caregiver involved in decision-making?

Goals should be co-developed. Assent and informed consent are ethical requirements. The individual's preferences and values matter in selecting both goals and methods.

YES → Proceed with collaborative plan NO → Engage in shared decision-making

Step 4: Verify your approach

✓ Is your intervention matched to the assessed function?
✓ Are you using the least restrictive effective approach?
✓ Is assent being monitored throughout?
✓ Do you have a data collection plan?
✓ Is there a plan for generalization and maintenance?

Key Takeaways

Individualization is non-negotiable. The best approach for one individual may not be appropriate for another, even with the same topography.
Assessment drives intervention. Function-based approaches consistently outperform topography-based ones in the literature.
Ethics are active, not passive. Ethical practice requires ongoing analysis, not just initial compliance.
Document everything. Both the decision to intervene and the decision not to intervene require documentation and justification.
Stay current. The evidence base in this area is evolving. What was standard practice five years ago may not reflect current best practices.

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Competing Stimulus Assessments: Recent Advances and Applications — Louis Hagopian · 1 BACB General CEUs · $0

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Clinical Disclaimer

All behavior-analytic intervention is individualized. The information on this page is for educational purposes and does not constitute clinical advice. Treatment decisions should be informed by the best available published research, individualized assessment, and obtained with the informed consent of the client or their legal guardian. Behavior analysts are responsible for practicing within the boundaries of their competence and adhering to the BACB Ethics Code for Behavior Analysts.