Translated from the Portuguese original. Read the original (Português)
Applied Behavior Analysis (ABA) is a science that uses what is known about how behavior is learned to bring about changes that truly matter in people's lives — always tracking results with measurement and data. It is not “a method for autism”: it is applied to education, health, sports, organizations, and many other fields, although it has strong use and good evidence in supporting autistic people.
ABA is the systematic application of the principles of behavior analysis — a field developed from the work of B. F. Skinner — to bring about socially significant changes in behavior, always guided by measurement and data analysis. In other words: a goal that matters to the person is defined, an intervention is carried out in a planned way, and the numbers are checked to see whether the change is actually happening.
ABA is not “a method for autism”
It is common to hear “ABA” as if it were synonymous with autism therapy. In fact, ABA is an applied science: the same principles about how we learn behaviors are used in very different contexts. It shows up in:
- Education — teaching reading, math, and study strategies;
- Health — treatment adherence, sleep and eating habits;
- Sports — improving technique and performance;
- Organizations — workplace safety and performance management.
That said, ABA has strong use and evidence in supporting autistic people, helping with the development of communication, autonomy, and everyday skills. But reducing all of ABA to autism is like saying math “is a subject about money”: true in part, but much smaller than the field really is.
How ABA works: a cycle guided by data
At the heart of ABA is data-driven decision making. Before changing anything, a baseline is recorded (how the behavior looks today). Then progress is measured and the plan is adjusted according to what the numbers show. It is not “guesswork”: if the strategy does not work, it changes.
The seven dimensions of ABA
In a classic 1968 article, Baer, Wolf, and Risley described seven dimensions that define what applied behavior analysis actually is. They work as a “quality control” for the work. Tap each card to see what it means:
Everyday tools
To teach skills and support change, ABA uses a set of well-studied procedures. Some of the best known:
- Positive reinforcement — offering something valued right after the desired behavior, making it more likely to happen again.
- Functional analysis — investigating the “function” of a behavior, that is, what purpose it serves and what maintains it.
- Discrete trial training (DTT) — teaching in short, structured steps, with a clearly defined beginning, middle, and end.
- Naturalistic teaching (NET / NDBI) — teaching within play and everyday situations, building on the person's interests.
- Shaping — reinforcing successive approximations until reaching the target behavior.
- Chaining — teaching a sequence of steps that together form a larger skill (such as brushing teeth).
- Prompting and fading — giving help at first and gradually withdrawing it, so the person does it on their own.
Data-guided decisionsNone of this is applied “in the dark.” A baseline is defined, progress is measured over time, and the plan is adjusted according to what the data show is — or is not — working for that person.
An ethical, contemporary ABA
Current ABA puts the person at the center. Good practice seeks the assent of the participant (signs that the person is comfortable and in agreement), focuses on quality of life and autonomy, individualizes each plan, and respects neurodiversity.
An important myth to debunkABA is not “training” and is not based on punishment. The focus is teaching skills through reinforcement and respect for the person, expanding autonomy and well-being — not forcibly “molding” someone to look “normal.”
Who is the professional?The internationally certified professional is the behavior analyst — for example, someone who holds the BCBA certification. This is the person who assesses, plans the intervention, tracks the data, and adjusts the work individually.
Test your understanding
Quick quiz
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Further reading
- Baer, D. M., Wolf, M. M., & Risley, T. R. (1968). “Some current dimensions of applied behavior analysis”. Journal of Applied Behavior Analysis.
- Cooper, J. O., Heron, T. E., & Heward, W. L. Applied Behavior Analysis (3rd ed.).
- National Standards Project (National Autism Center) — reviews of evidence-based practices.
This entry is educational and does not replace assessment, diagnosis or treatment by a qualified health professional. Every person is unique — for a specific case, seek individual guidance.