Single-Subject Research Law and Legal Definition

Single-subject research is a scientific methodology used to define basic principles of behavior and establish evidence-based practices. Mainly, four principal methods are used in single-subject research. They are changing criterion, reversal (ABA) method, alternating treatment method, and multiple baseline method.

Changing Criterion Method: A criterion for reinforcement is changed across the experiment to demonstrate the functional relationship between the reinforcement and the behavior in changing criterion method.

Reversal or ABA Method: ABA method design shows a strong reversal from baseline-A to treatment-B and back again. The basic principle is that a variable resumes its effects when reapplied.

Alternating treatment Method: In alternative treatment method, comparative effect of two treatments is measured. Two treatments are alternated in a speedy succession and associated changes are graphed for comparison.

Multiple Baseline Method: Multiple baseline method is applied to human experiments in response to practical and ethical issues. Two or more behaviors are graphed and a change is made to one, but not the other two. Then change is made to the second but not the third for analysis.