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

PECS vs. SGD-Based Communication: Selecting the Right AAC Approach for Learners with ASD

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 andy bondy, ph.d | what's the emperor wearing these days? communicating with pecs, sgds and apps | 1 hour, 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
Output Modality	PECS: Physical picture exchange; output is the card handed to the communication partner	SGD: Synthesized or recorded speech output; audible to any nearby communication partner
Partner Familiarity Requirement	PECS: Requires a physically present, trained communication partner to receive the exchange and deliver the reinforcer	SGD: Speech output is comprehensible to unfamiliar partners without training; expands communicative range beyond trained partners
Motor Access	PECS: Requires sufficient motor control to select, remove, and physically exchange a picture card; generally accessible for most motor profiles	SGD: Requires touch accuracy or access method appropriate to motor profile; may require switch access, eye gaze, or other alternative access for learners with motor differences
Evidence Base	PECS: Extensive peer-reviewed research base including multiple randomized controlled trials; well-established acquisition procedures across PECS phases	SGD: Strong evidence base for dedicated SGDs; evidence for specific app-based implementations is growing but less extensive than for PECS
Cost and Portability	PECS: Low cost for materials; picture boards and cards can be created and replaced inexpensively; portable across contexts with minimal infrastructure	SGD: Dedicated SGDs are expensive; app-based systems are lower cost but require tablet hardware; device durability and battery life are implementation considerations
Communicative Complexity Ceiling	PECS: Later phases address sentence structure and commenting, but physical card manipulation limits speed and complexity of extended communicative sequences	SGD: Supports more rapid, complex communicative sequences; vocabulary can be organized to scale with communicative development; more closely approximates natural spoken communication

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Clinical Decision Framework

Use this framework when approaching andy bondy, ph.d | what's the emperor wearing these days? communicating with pecs, sgds and apps | 1 hour 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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Andy Bondy, Ph.D | What's the Emperor Wearing These Days? Communicating with PECS, SGDs and Apps | 1 Hour — Autism Partnership Foundation · 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.