Experimental Design, Research Methodology

Between-Subjects Design vs. Within-Subjects Design

By Dr. Mohammed Looti / / 1 min read
Scientifically Reviewed · Dr. Marwa Abd-Alazim · November 7, 2026
Medically & Scientifically Reviewed Verified: November 7, 2026
Dr. Marwa Abd-Alazim PhD in Psychology
Faculty Member • University of Kerbala
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This content undergoes rigorous scientific peer-review and medical editorial standards at Arab Psychology Network to ensure clinical accuracy, validity, and compliance with evidence-based guidelines from leading psychological and healthcare authorities (APA / WHO).

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BETWEEN-SUBJECTS ARCHITECTURE:
Cohort A (Participants 1 to N) –> [ Treatment Condition ] –> Measure Outcome
Cohort B (Participants N+1 to 2N) –> [ Control Condition ] –> Measure Outcome
* Advantage: Absolute temporal isolation.
* Vulnerability: Participant variability inflates error variance.

WITHIN-SUBJECTS ARCHITECTURE:
Same Cohort (Participants 1 to N) –> [ Condition A ] –> Temporal Transition –> [ Condition B ]
* Advantage: Participant variance partitioned out.
* Vulnerability: Carryover effects, fatigue, practice, and sensitization.

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About the Author: Dr. Mohammed Looti

An academic and researcher specialized in educational psychology and a faculty member at the University of Kerbala. He holds a PhD in his field, and his research interests center on positive psychology, the development of psychological scales, and cognitive emotion regulation. Dr. Looti is distinguished by his contemporary research approach, focusing on the psychological effects of modern technology and artificial intelligence on mental health and identity formation among young people. His scholarly contributions also extend to studying the dynamics of family communication and its role in building self-efficacy and leadership skills, in addition to his research on mindfulness programs and psychological recovery — making him an active researcher enriching the field of educational and applied psychology.

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Cite This Article

Looti, M. (2026, November 7). Between-Subjects Design vs. Within-Subjects Design. PSYCHOLOGICAL DATABASE. https://english.arabpsychology.com/comparisons/between-subjects-design-vs-within-subjects-design/
Looti, Mohammed. “Between-Subjects Design vs. Within-Subjects Design.” PSYCHOLOGICAL DATABASE, 7 November 2026, https://english.arabpsychology.com/comparisons/between-subjects-design-vs-within-subjects-design/.
Looti, Mohammed. “Between-Subjects Design vs. Within-Subjects Design.” PSYCHOLOGICAL DATABASE. November 7, 2026. https://english.arabpsychology.com/comparisons/between-subjects-design-vs-within-subjects-design/.

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