Lesson 1.1 — History and Science of ABA

Where ABA comes from

Applied Behavior Analysis did not emerge from a single moment. It developed over decades as researchers moved from studying behavior in laboratories to applying those findings to real human lives in real settings.

The story starts in the early 20th century with John B. Watson, who argued that psychology should focus only on observable behavior rather than internal mental states. This became known as behaviorism, the idea that behavior, not private thought or feeling, is the proper subject of scientific study. Watson’s famous (and controversial) experiments demonstrated that emotional responses could be learned, setting the stage for everything that followed.

B.F. Skinner expanded Watson’s work by developing the theory of operant conditioning, the idea that behavior is shaped and maintained by its consequences. Where Watson focused on reflexes and classical conditioning, Skinner showed that voluntary behavior could be systematically increased or decreased by manipulating what follows it. Skinner’s work in the mid-20th century established the foundational principles that ABA practitioners use today: reinforcement, punishment, extinction, and stimulus control.

Applied Behavior Analysis as a formal discipline is generally traced to a 1968 paper by Baer, Wolf, and Risley titled “Some Current Dimensions of Applied Behavior Analysis,” which defined the field and outlined its defining characteristics. That paper established the framework practitioners still use today.

The seven dimensions of ABA

One of the most tested topics in this area is the seven dimensions of ABA, often remembered with the acronym BACB ATE or GAMBATE. These dimensions describe what makes ABA distinct from other approaches to behavior change.

1. Applied ABA focuses on behaviors that are socially significant, behaviors that matter to the individual and to society. The goals of intervention are selected because they improve quality of life, not just because they are easy to measure or interesting to study.

2. Behavioral ABA targets behavior that is observable and measurable. It does not target internal mental states, feelings, or attitudes directly, only behaviors that can be seen, counted, or timed.

3. Analytic ABA requires demonstration of a functional relationship between the intervention and the behavior change. In other words, the analyst must show that the intervention, not something else, caused the change in behavior.

4. Technological ABA procedures are described clearly and completely enough that a trained practitioner who was not involved in developing the procedure could implement it accurately. “Reinforce good behavior” is not technological. “Deliver a token immediately following each unprompted correct response during discrete trials” is technological.

5. Conceptually Systematic ABA interventions are connected to and derived from the principles of behavior analysis. Procedures are not arbitrary; they are grounded in the established science of behavior.

6. Effective ABA produces meaningful, practical improvements in behavior. Small statistical changes that have no real impact on a person’s life do not meet this standard.

7. Generalizable Behavior changes produced by ABA should extend beyond the training conditions, to other settings, people, and times. A skill taught at a clinic that never appears at home or school is not truly generalizable.

Exam tip: The exam often tests whether you can identify which dimension is being described in a scenario. Pay special attention to analytic (functional relationship), technological (written clearly enough to replicate), and applied (socially significant), as these three cause the most confusion.

What counts as behavior?

For the purposes of ABA, and for the exam, behavior is any observable and measurable action performed by a living organism. This is broader than it might seem. Behavior includes:

• Overt actions (hitting, talking, completing a task)
• Verbal behavior (asking for something, answering a question)
• Some private events (though these are treated cautiously in ABA)

Behavior does not include:

• Dead-man actions (“sitting quietly” by itself, since a dead man can sit quietly)
• Inferred internal states (“is frustrated,” “feels anxious”)

The dead man test is a useful check: if a dead person could do it, it is not behavior for ABA purposes. “Not hitting” fails the test. “Keeping hands in lap while completing a task” passes it.

Quiz 1.1 — History and Science of ABA

10 questions · No time limit · Read all explanations before moving on