Applied Behavior Analysis program is a scientific discipline concerned with developing techniques based on the principles of learning theory of B.F. Skinner. This science studies how learning takes place and how behavior function, therefore to build techniques that increase the possibility of healthy useful behaviors and decreases the possibility of harmful nonfunctional behaviors. A few types of therapies based on ABA principles are: discrete trial learning, incidentental teaching or natural environment training, verbal behavior, pivotal response training, and natural language paradigm.