ABA is the design, implementation, and evaluation of environmental modifications to produce socially significant improvement in human and animal behavior. ABA includes the use of direct observation, measurement, and functional analysis of the relations between environment and behavior. ABA is based on the science that an individuals behavior is determined by past and current environmental events in conjunction with organic variables such as genetics. Thus, it focuses on explaining behavior in terms of external events that can be modified rather than internal constructs that are beyond our control.