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Understanding ABA Therapy: What Parents Need to Know

Applied Behaviour Analysis (ABA) is the basis of most evidence-based autism treatment models. Learn what it is, how it works, and what to look for in a quality provider.

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services
Published
January 5, 2026
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7 min read
Applied Behaviour Analysis (ABA) is the basis of most evidence-based autism treatment models. Learn what it is, how it works, and what to look for in a quality provider.

End The Wait Ontario article · Verified 2026-10-01

Quick Answer: Understanding ABA Therapy: What Parents Need to Know

Editorial team

Applied Behaviour Analysis (ABA) is the basis of most evidence-based autism treatment models. Learn what it is, how it works, and what to look for in a quality provider.

Verified: 2026-10-01Scope: Ontario, Canada

Understanding ABA Therapy: What Parents Need to Know

Applied Behaviour Analysis (ABA) is often recommended for autistic children, but many parents don't fully understand what it involves.

What Is ABA Therapy?

The Basics

ABA is a type of therapy based on the science of learning and behaviour. It focuses on:

  1. Increasing helpful behaviours (communication, social skills, daily living)
  2. Decreasing challenging behaviours (tantrums, aggression, self-injury)
  3. Teaching new skills by breaking them into manageable steps

The Evidence Base

ABA is one of the most researched autism interventions:

  • 40+ years of peer-reviewed studies
  • Recognized as effective by:
  • U.S. Surgeon General (1999 report on mental health)
  • American Academy of Pediatrics

In Ontario, applied behaviour analysis is one of the core clinical services the Ontario Autism Program can fund, based on a child's needs.

How Does ABA Work?

Assessment

Every ABA program starts with assessment:

  • Skill assessment: What can your child do now?
  • Behaviour assessment: Why is challenging behaviour happening?
  • Preference assessment: What motivates your child?

Goal Setting

Based on assessment, the team sets SMART goals:

  • Specific: Clear and defined
  • Measurable: Can observe and count progress
  • Achievable: Realistic for your child
  • Relevant: Important for your child's life
  • Time-bound: Clear target date

Teaching Methods

Common ABA teaching strategies:

  1. Discrete Trial Training (DTT): Structured, repeated practice
  2. Natural Environment Training (NET): Learning during play and daily activities
  3. Pivotal Response Training (PRT): Child-directed learning
  4. Verbal Behavior (VB): Focus on communication

Data Collection

Progress is tracked through:

  • Daily session notes
  • Skill tracking charts
  • Behaviour frequency counts
  • Parent feedback

What Does ABA Look Like?

Typical Session

A typical ABA session might include:

  1. Warm-up: Relationship-building, preferred activities
  2. Skill building: Working on specific goals
  3. Breaks: As needed for regulation
  4. Practice in natural contexts
  5. Parent wrap-up: Review progress and homework

Intensity Levels

The second edition (2020) of practice guidelines from the Council of Autism Service Providers, a U.S. trade group for autism service providers, describes 10-25 hours per week for focused ABA and 30-40 hours per week for comprehensive ABA. Research on the right number of hours is mixed. Some studies link more hours to better results, but one randomized trial with toddlers found no overall difference in outcomes between 15 and 25 hours per week. The right number of hours depends on things like:

  • Your child's age
  • Current skill levels
  • Family goals
  • Other therapies/services

Finding a Quality ABA Provider

Red Flags

⚠️ Avoid providers who:

  • Use punishment or aversive strategies
  • Won't let parents observe sessions
  • Don't track progress with data
  • Make guarantees about "cure"
  • Won't collaborate with other professionals

Green Flags

✓ Look for providers who:

  • Use positive reinforcement primarily
  • Encourage parent involvement
  • Share data regularly
  • Individualize programs
  • Continuously train their staff
  • Are registered with the College of Psychologists and Behaviour Analysts of Ontario as a Behaviour Analyst, or supervised by one

Important Considerations

The Controversy

Some autism rights and neurodiversity advocates have raised concerns about ABA. Their concerns range from its history to current methods and goals. Modern ABA emphasizes:

  • Assent (child agrees to participate)
  • Individualized goals
  • Quality of life outcomes

Your Role as Parent

You are essential to your child's success:

  • Collaborate on goal setting
  • Practice skills between sessions
  • Provide feedback to the team
  • Advocate for your child's needs

Sources: American Academy of Pediatrics, Identification, Evaluation, and Management of Children With Autism Spectrum Disorder (Pediatrics, 2020); Behavior Analyst Certification Board, Ethics Code for Behavior Analysts and About Behavior Analysis; Council of Autism Service Providers, ABA practice guidelines (second edition, 2020); Sandbank et al., BMJ, 2023; Rogers et al., Journal of the American Academy of Child and Adolescent Psychiatry, 2021; Leaf et al., Journal of Autism and Developmental Disorders, 2022; Mental Health: A Report of the Surgeon General (1999); Ontario Autism Program core clinical services (ontario.ca); College of Psychologists and Behaviour Analysts of Ontario

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Verified references

Verified references and sources

Watchdog Reports

  • [2024]
    Ministry of Children, Community and Social Services: Spending Plan Review
    Financial Accountability Office of Ontario (FAO) • Watchdog report • 2024-06-05

FOI Records

  • [2026]
    Ontario Autism Program figures as of May 13, 2026 (MCCSS, released under Freedom of Information to the Ontario Autism Coalition; published in the OAC "OAP At A Glance" update, July 2026)
    Ministry of Children, Community and Social Services (Ontario), obtained by the Ontario Autism Coalition • FOI record • 2026-05-13

Official Organizations

  • [2025]
    Autism Spectrum Disorders Fact Sheet (updated September 17, 2025)
    World Health Organization (WHO) • Official • 2025-09-17

Peer-Reviewed Research

  • [2010]
    Randomized, Controlled Trial of an Intervention for Toddlers With Autism: The Early Start Denver Model
    Dawson G, Rogers S, Munson J, et al. (Pediatrics) • Academic • 2010-01-01
  • [2018]
    Early intensive behavioural intervention (EIBI) for young children with autism spectrum disorders (ASD)
    Reichow B, Hume K, Barton EE, Boyd BA (Cochrane Systematic Review) • Academic • 2018-05-09

Guides and tools related to this page.

Claims and sources from this page(3)

How many children are on the Ontario autism waitlist?

Latest FOI data shows 91,974 children are registered in the Ontario Autism Program (May 2026), while 22.5% have active funding agreements. [FOI] An active funding agreement does not mean a child is receiving services; it is an administrative status distinct from service delivery. Some families report waits of 5+ years for families registered in August 2021 (community-reported, Ontario Autism Coalition, July 2026). That report is not a province-wide average. Last verified: 2026-08-10

Source: MCCSS FOI data via Ontario Autism Coalition [OAC] · Open source record

Has the government cleared the autism backlog?

No. Government claims of "clearing the backlog" refer only to administrative invitations, not actual service delivery. While 91,974 children are registered, 71,263 still lack an active funding agreement. May 2026 data confirms that only 22.5% have that administrative status; it does not establish service receipt. Pending verification: Editorial review not recorded. Excluded from citation-ready exports.

Source: MCCSS FOI via OAC · May 2026 · Open source record

Which Ontario hospitals diagnose autism?

Major autism diagnostic centres in Ontario include Hospital for Sick Children (SickKids), Holland Bloorview, McMaster Children's, CHEO, and Children's Hospital London. [OAP] Ontario does not publish wait times for these publicly funded centres, so ask each one for its current wait. Private clinics also offer assessments for a fee; ask for a written fee quote and the expected wait.

Source: Ontario Autism Program [OAP] · Open source record

Sources on this page

The source chain stays visible.

Key claims are paired with their source, evidence tier, and verification date so readers can inspect the public record directly.

Facts5
Sources5

Early Start Denver Model (ESDM) delivered to children aged 18–30 months produced significant gains in IQ, adaptive behaviour, and autism severity — some children no longer met diagnostic criteria at follow-up

Primary sourceDawson G, Rogers S, Munson J, et al. (2010)Verified 2010-01-01

Cochrane systematic review finds evidence that early intensive behavioural intervention (EIBI) may produce positive effects on adaptive behaviour and communication for young children with ASD (low certainty of evidence)

Primary sourceReichow B, Hume K, Barton EE, Boyd BA (2018)Verified 2018-05-09

WHO recommends accessible, community-based early interventions for children with autism. Timely evidence-based psychosocial interventions improve communication and social engagement

Primary sourceWorld Health Organization (2025)Verified 2025-09-17

22.5%

Only 20,711 children have active funding agreements (22.5%), less than one in four

Primary sourceMCCSS FOI via OAC · May 2026Verified 2026-08-10
Last system verification: 2026-08-10. Next scheduled update: 2026-11-05.

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Founder & Autism Advocate

Lived experience: Parent of autistic child navigating OAP system