By Matt Harrington, BCBA · Behaviorist Book Club · Research-backed answers for behavior analysts
Ableism is the systemic devaluation of and discrimination against people with disabilities, based on the assumption that typical abilities are superior and that disability is inherently negative. In ABA practice, ableism can manifest as targeting harmless self-stimulatory behaviors for reduction because they look atypical, prioritizing compliance and obedience over self-determination and self-advocacy, framing all autism-related behaviors as deficits requiring correction rather than differences that may serve adaptive functions, designing interventions that prioritize making the client appear more neurotypical over genuinely improving their quality of life, and insufficient involvement of the client in decisions about their own treatment. Recognizing these patterns is the first step toward more ethical and person-centered practice.
Informed consent is a legal and ethical process through which a client or their legal guardian agrees to receive services after being provided with information about the nature, risks, benefits, and alternatives to those services. Assent is the client's ongoing, active agreement to participate in specific intervention activities. While consent is typically obtained once at the start of services and updated periodically, assent is a dynamic, moment-to-moment process assessed through behavioral observation during every session. A guardian may provide informed consent for ABA services, but the client themselves demonstrates or withdraws assent through their behavior during each interaction. Both are ethically important, but assent adds a layer of respect for the client's autonomy that consent alone does not provide.
For clients who do not communicate verbally, assent withdrawal must be identified through careful observation of behavioral indicators. These may include turning away from the therapist or materials, moving toward the door or away from the therapy area, pushing materials away, covering their face or ears, engaging in self-injurious behavior or aggression, going limp or becoming passive and unresponsive, crying or displaying signs of distress, and refusing to follow instructions they typically follow willingly. Each client will have their own unique profile of assent withdrawal signals, and practitioners should develop individualized lists of these indicators based on baseline observation and ongoing data collection. These signals should be taken as seriously as a verbal refusal would be.
No. Assent-based practice does not mean that clients are never asked to do things that are initially non-preferred. It means that practitioners systematically monitor the client's ongoing willingness to participate and respond appropriately when assent withdrawal is indicated. There are legitimate clinical situations where a client may initially resist an activity but then engage successfully once they contact reinforcement. The key distinction is between transient resistance that resolves quickly as the client engages with the activity and persistent, escalating distress that indicates the client genuinely does not want to participate. When the latter occurs, practitioners should pause, modify the approach, or discontinue the activity. For health and safety situations, the least restrictive approach should be used with careful documentation.
Five practical methods for collecting assent data include direct observation coding of approach and avoidance behaviors at session start and during transitions between activities, frequency recording of unprompted requests to stop or leave activities and of spontaneous bids to begin or continue activities, interval recording of facial affect and body language indicators using a predetermined coding system, event recording of verbal or gestural expressions of willingness or unwillingness to participate in specific programs, and a session-level assent rating scale completed by the implementing therapist after each session that captures an overall assessment of the client's participation quality. Using multiple methods provides a more complete picture than any single measure, and data should be reviewed alongside other clinical data at each treatment plan update.
An ableism check involves systematically evaluating each proposed treatment target against criteria designed to identify potential ableist bias. For each proposed goal, ask and document answers to these questions: Does this behavior cause genuine harm to the client's health, safety, or quality of life? Would reducing this behavior meaningfully improve the client's access to reinforcement, relationships, or opportunities? Does the client express a desire to change this behavior? Could environmental modifications or accommodations address the concern without requiring behavior change? Is this goal primarily motivated by the desire to make the client appear more neurotypical? Would an autistic adult reviewing this goal agree that it serves the client's genuine interests? Document your analysis and discuss it with the family and team.
Approach these conversations with empathy and respect, recognizing that families are navigating complex social pressures and genuinely want what is best for their child. Avoid being confrontational or judgmental. Instead, explore the family's underlying concerns and values by asking what they hope their child's life will look like and what specific situations are prompting the request. Share information about the research on ableism in therapeutic services and the perspectives of autistic adults in accessible, non-academic language. Collaboratively explore alternative goals that address the family's underlying concerns while respecting the client's neurodivergent identity. If a goal is genuinely harmful or ableist, explain your clinical and ethical reasoning for recommending against it while offering constructive alternatives that the family can support.
Yes. Assent-based practice does not require abandoning structure, systematic teaching procedures, or data-based decision-making. It requires adding a layer of attention to the client's experience and willingness to participate. Structured teaching sessions can incorporate assent-based practices by offering choices within the structure, such as which materials to use or which program to work on first, by monitoring engagement and affect throughout sessions, by having clear protocols for responding to assent withdrawal, by building in regular breaks and preferred activities, and by adjusting the pace and demands based on the client's signals. Many practitioners find that incorporating assent-based practices actually improves the efficiency and effectiveness of structured programming because clients who are willing participants learn more effectively.
Assent-based practice and reinforcement-based intervention are deeply complementary. When intervention maintains client assent, it is by definition not relying primarily on aversive control. Clients who demonstrate ongoing assent through approach behavior, active participation, and positive affect are experiencing the intervention as reinforcing rather than aversive. Conversely, when clients consistently withdraw assent from a particular intervention, this signals that the intervention is functioning as an aversive experience regardless of the practitioner's intention. Shifting to maintain assent typically requires increasing the reinforcement density, improving the quality of the therapeutic relationship, providing more meaningful choices, and ensuring that the demands of the intervention are appropriately matched to the client's current skill level.
Training RBTs in assent-based practices should include both conceptual understanding and practical skills. Begin with education about what assent and assent withdrawal are and why they matter, using concrete examples and video models rather than abstract definitions. Provide each RBT with a client-specific list of behavioral indicators of assent and assent withdrawal for every client on their caseload. Train the response protocol for assent withdrawal through role-play and in-vivo coaching. Include assent data collection in their regular data responsibilities and review this data during supervision meetings. Address the common concern that honoring assent withdrawal will prevent teaching by demonstrating that willing participants learn more effectively. Finally, create a supervision culture where RBTs feel comfortable reporting assent withdrawal without fear that they will be seen as ineffective.
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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.