Applied Behavior Analysis (ABA) is an applied science devoted to the understanding and improvement of human behavior. It is a scientific approach for discovering environmental variables that reliably influence socially significant behavior and for developing a technology of behavior change that takes practical advantage of those discoveries.

-Cooper, Herron, Heward

ABA is an evidence-based method of examining and changing what people (and other living creatures) say and do.

       – Mayer, Sulzer-Azaroff, Wallace

ABA is a scientific method, a technology, and/or a professional approach. Those who are practicing applied behavior analysis become increasingly able to successfully guide learning and performance in specific constructive directions.

                                    – G. Roy Mayer and Beth Sulzer-Azaroff