Single-Case Study

A research methodology in which an individual participant serves as their own control, with systematic measurement of behavior across different conditions such as baseline and intervention phases. The ABA design — where A represents baseline and B represents intervention — is a common format that allows researchers to demonstrate causal relationships by showing changes in behavior when an intervention is introduced and withdrawn. Single-case designs are widely used in speech-language pathology, rehabilitation, and assistive technology research where large group studies may not be feasible.