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What is assent in ABA, and how do I build assent-based practice?

What assent and assent withdrawal look like, why they matter, and practical ways to build them into sessions and plans.

By The Autism Kit teamUpdated Sep 27, 2026 · 1 min read
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The short answer

Assent is a client's ongoing agreement to take part, shown through words, actions or body language, especially for children who can't give legal consent. Assent withdrawal is any sign they want to stop. Assent-based ABA watches for these signals, responds to them, and adjusts the session or plan so learning happens with the client, not to them.

Key takeaways
  • Assent is the client's ongoing agreement to participate.
  • Withdrawal can be words, turning away, pushing materials or leaving.
  • Respond by pausing and adjusting, not pushing through.
  • Build assent into plans, training and data.

What does assent look like?

Signs of assent often include approaching the teaching area, engaging with materials, smiling or relaxed posture, and choosing to continue. Signs of withdrawal include saying no, turning or moving away, pushing materials away, crying, or increased distress.1

Building rapport and gaining assent before starting services is part of the RBT 2026 training.3

Why does assent matter?

The BACB Ethics Code asks behavior analysts to treat clients with compassion, dignity and respect.2 Assent-based practice puts that into action, and it responds to concerns raised by autistic adults about older, rigid approaches.

How do I build assent into sessions?

Try
  • Offering choices of activity, order and reinforcer
  • A visible way to ask for a break
  • Pairing yourself and the space with good things
  • Visual schedules so the session is predictable
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  • Physically guiding through a task after refusal (outside safety plans)
  • Blocking exits to keep a client at the table
  • Ignoring distress to finish trials

How do I build it into plans and supervision?

  • Add assent signals and responses to each client's plan
  • Train RBTs to recognize and respond to withdrawal
  • Record assent in session data
  • Review patterns: frequent withdrawal is information about the plan1

What can I do this week?

0 of 3 done

Read next: What is the BACB Ethics Code?

Common questions

No. Consent is typically given by a legal guardian. Assent is the client's own agreement, which you watch for moment to moment.

Sources

  1. Breaux CA, Smith K. Assent in applied behaviour analysis and positive behaviour support: ethical considerations and practical recommendations. International Journal of Developmental Disabilities, 2023. doi.org
  2. Behavior Analyst Certification Board: Ethics codes. bacb.com
  3. Behavior Analyst Certification Board: RBT 2026 40-hour training requirements and curriculum outline. bacb.com

This guide shares general information and our team's perspective, based on the sources above. It isn't legal, billing or certification advice: always check the BACB's current requirements, your state's rules and your organization's policies. How we write our guides.

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