Dr. Orhan Aydin is currently an Associate Professor in the Faculty of Educational Sciences at Ankara University. His research interests include data analysis in single-case experimental designs (SCEDs), effect-size measures in SCEDs, and meta-analyses related to special education interventions, particularly autism research. He also conducts experimental studies, particularly using SCEDs to improve the skills of children with special needs and the abilities of teachers or teacher candidates who work with students with special needs.