The ABA Therapy Controversy: Understanding Both Sides

What Is the ABA Controversy?

Applied Behavior Analysis (ABA) is a therapy based on the science of learning and behavior. It uses systematic reinforcement to teach new skills and reduce behaviors that interfere with daily functioning. ABA has more randomized controlled trials and peer-reviewed evidence behind it than any other autism intervention, and it is the primary therapy historically funded by Ontario’s OAP.

At the same time, ABA is the most contested autism therapy in the autistic community. Many autistic adults, self-advocacy organizations, and researchers argue that ABA — particularly older forms — caused significant harm. The debate involves deeply important questions about therapeutic goals, autistic identity, and what “success” in autism therapy should mean. Families deserve to understand both the evidence for ABA’s effectiveness and the substantive concerns raised about its application.

Historical Concerns

Early ABA for autism, particularly intensive Lovaas-method discrete trial training (DTT) developed in the 1960s–80s, used techniques that are now widely condemned:

• Electric shocks and other aversive stimuli to suppress autistic behaviors (Lovaas’s original research included these; they are now prohibited by most professional bodies)
• Physical restraint and punishment-based contingencies
• Intensive suppression of stimming and other natural autistic behaviors regardless of whether those behaviors were harmful
• Goals explicitly designed to make children “indistinguishable from their peers” — a goal that many argue prioritizes appearance over wellbeing

Many autistic adults who received intensive ABA as children have shared accounts of lasting psychological harm — including symptoms consistent with PTSD, anxiety, and the burden of learned masking. These accounts have been influential in the autistic self-advocacy movement and have prompted significant change in the ABA field.

How Modern ABA Has Changed

Contemporary ABA has evolved substantially in response to both research and community criticism. Modern evidence-based approaches include:

• Naturalistic Developmental Behavioral Interventions (NDBIs):Play-based, child-led approaches — including Pivotal Response Treatment (PRT), the Early Start Denver Model (ESDM), and JASPER — that embed learning in natural routines and follow the child’s interests
• Prohibition of aversives: The Behavior Analyst Certification Board (BACB) ethics code requires practitioners to use the least restrictive, most effective procedures
• Focus on functional communication: Modern ABA increasingly prioritizes helping autistic people communicate effectively, including via AAC
• Neurodiversity-affirming ABA: A growing number of BCBAs explicitly frame their practice within a neurodiversity paradigm, targeting skills that improve quality of life rather than normalization

The extent to which these changes have been adopted varies widely across individual providers. Families should ask specific questions about any provider’s approach before beginning services.

What Autistic Self-Advocates Say

The Autistic Self Advocacy Network (ASAN) and similar organizations have called for alternatives to ABA, particularly any ABA that targets behaviors that are harmless but autistic-typical. Common concerns from autistic self-advocates include:

• Suppression of stimming robs autistic people of important self-regulatory tools and forces harmful masking
• Goals focused on eye contact, sitting still, and appearing neurotypical do not serve the autistic individual’s wellbeing
• The 20–40 hour/week intensity of early intensive ABA leaves little room for free play, rest, or autistic community
• Autistic voices have been largely excluded from designing ABA research and practice

At the same time, many autistic individuals have had positive experiences with specific ABA-based interventions — particularly those focused on functional communication. The autistic community is not monolithic, and individual experiences with ABA vary widely.

Questions to Ask an ABA Provider

Before enrolling in an ABA program, families should ask:

• Do you use any aversive techniques? What is your protocol for challenging behaviors?
• What behaviors are you targeting and why? Are these behaviors harmful, or simply autistic?
• How will my child’s comfort and preferences be incorporated into sessions?
• Do you permit and respect stimming and other self-regulatory behaviors?
• What are your BCBA’s specific training and experience with autistic children?
• Are autistic adults involved in consulting on or supervising your programs?
• How will we measure success — and who defines success?

Compare all autism therapy types or learn about OAP funding amounts for 2026.

Frequently Asked Questions