Applied Behavior Analysis or ABA is the application of the empirically validated principles of behavior to build skills through directed instruction and to treat problem behaviors by determining the function of them and arranging for effective intervention that addresses the behavior's function. ABA is an approach to analyzing each individual's skill deficits and problem behaviors. Though Autism is a disorder that involves specific general impairments, each child brings with them a distinct set of difficulties. No single treatment package can be used for all children and ABA is a method for examining the needs of each person. Specific instruction can then be tailored to a child's unique situation.