Client Assent in ABA - A Plain Guide

Client assent means a learner keeps saying yes to their own therapy. It is their willingness to take part, shown through words and actions. A young child or a person who cannot legally sign a form still gets a voice. Assent is how we hear that voice.

This matters for BCBAs, RBTs, and parents alike. It keeps therapy respectful and safe. When we watch for assent, we treat the learner as a partner, not a project. That builds trust, and trust makes the work go better.

What client assent really means#

Assent is not the same as a signature on a form. It is behavior that tells us a person is okay to keep going. It can be a smile, a nod, or reaching for a task. It can also be turning away, crying, or leaving the room.

Matt Harrington points to the ethics code for a clear definition. The code calls assent a vocal or non-vocal verbal behavior, meaning words or actions that send a message. That message shows willingness to take part in services. It is used for people who cannot give informed consent because of age or disability.

Nicky Schneider keeps it simple. She frames assent as the learner's own choice about therapy.

It's the student or the client's willingness to participate. From the talk. Nicky Schneider

Assent is watched, not won once#

One idea shows up again and again. Assent is not a box you check at the start. It is something you keep watching for the whole time.

Matt Harrington makes this point sharp and clear.

assent is not acquired once. It's observed continuously. From the talk — Matt Harrington

He explains why this fits ABA so well. A single therapy session runs long. A person can feel fine at the start and not fine ten minutes later. So we keep checking. At every point, we want a current sign that the learner is still on board.

Matt also describes assent as a living agreement. It is not a one-time yes.

And ascent means a continuous dynamic agreement to the continued intervention process. From the talk — Matt Harrington

How to read assent in the room#

Different experts teach us to watch the body, not just the mouth. Some signs are easy. Some take a trained eye.

Nicky Schneider splits the signs into two groups. Vocal signs are the easy ones. A learner says no, and you know. Non-vocal signs need more care. She lists turning away, crying, screaming, anger, and falling to the floor. All of these can mean the person is not assenting.

Nikki teaches the happy signs too. She loves when a student takes your hand to join an activity. That reach is a clear sign of assent. So watch faces, watch feet, and watch whether the learner moves toward you or away.

Matt Harrington gives a simple rule of thumb. Moving toward something is often assent. Moving away is often non-assent. This gives new staff an easy first filter.

Consent and assent are not the same#

People mix up these two words. They are not the same, and the difference matters.

Nikki draws a clean line. Consent is the legal permission, given by an adult or guardian. It is about the right to run an FBA, meaning a study of why a behavior happens, or to start a plan. Assent is the learner's own willingness, shown through their behavior. One is legal. The other is lived, moment to moment.

Mellanie Page adds an ethics angle. Sometimes we spot something that could help a client right away. Our ego wants to act fast. She says we still slow down and get permission first.

Even though we know something might be effective, we are going to wait and make sure that we have that consent and assent. From the talk. Mellanie Page

Building assent into your process#

Assent works best when it is part of the plan, not an add-on. Several experts show how to bake it in.

Mark Malady builds assent right into an assessment. He uses a pre-teach step before each skill target, which he calls a pinpoint. This gives the learner input the whole way through. The assessment becomes something done with them, not to them.

John Stavitz shows the same idea in schools. In his universal protocol, students can opt out of parts of their day. Any sign of reluctance is taken seriously. A non-preferred activity or item is pulled right away.

Matt Harrington makes it very concrete in his practical work. He assumes a client is not assenting until they show him they are ready. He waits for a set number of social bids, meaning small friendly moves toward him, before he begins. The learner opts in first.

For a full walk-through of the ethics and the data, Assent: Don't just say Yes!- covers this topic in depth.

Honoring a no without giving up#

Honoring assent scares some clinicians. They worry it means the child now runs the show. The experts are clear that this is not true.

Nicky Schneider draws the line well. Honoring a withdrawal does not mean letting the child do anything they want.

Honoring a scent withdrawal does not mean letting a child do whatever they want. It means honoring their distress and working to approach the challenge together. From the talk. Nicky Schneider

Matt Harrington frames it as a prompt to change something. Assent is not a wall you hit and stop. It is a signal to shift your approach and try again in a kinder way.

Assent as a rights issue#

Brian Middleton zooms out to a bigger picture. He ties assent to basic human rights, not just good manners.

His test is simple. Can the person say no and have it honored? If yes, you are protecting a right. If no, you have crossed a line.

as soon as you take choice away from people, then it goes from being a value to a rights violation. From the talk. Brian Middleton

This raises the stakes. Assent is not a nice extra. It is part of treating people with dignity.

What the research says#

The published work backs up these expert views. It also shows the field is still growing here.

Morris and colleagues note that assent matters for ethics, self-determination, and choice. But they found very few articles that clearly described how to get assent from autistic learners. So they proposed a model to fill that gap (Morris, Detrick, & Peterson, 2021).

A survey of behavior analysts found a similar problem. Researchers use many different methods to seek consent and assent. Yet those methods are often left out of published papers. The authors call for more training, resources, and research (Mead Jasperse et al., 2023).

Newer work shows that training helps. One study taught BCBAs to spot and respond to assent withdrawal. After training, all of them could identify it, change their plans, and embed ongoing assent checks (Shpall & Kuhn, 2026). Another paper argues that therapy assent needs its own guidelines, since therapy and research have different goals (Flowers & Dawes, 2023).

FAQ#

What is the difference between consent and assent?

Consent is legal permission from an adult or guardian. It gives the right to run services or research. Assent is the learner's own willingness, shown through their behavior. You often need both at the same time.

How do you know if a client is not assenting?

Watch for behavior that moves away from the activity. Common signs are turning away, crying, screaming, or falling to the floor. A clear vocal no counts too. When you see these signs, pause and change your approach.

Do you only need to get assent once?

No. Assent is watched all through a session, not signed once at the start. A learner can feel fine one minute and upset the next. You keep checking so you always have a current sign of willingness.