قارن الطرق

	التجربة الميدانية أحادية التعمية	تصميم التجربة بالقياس القبلي والبعدي
المجال	التصميم التجريبي	التصميم التجريبي
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	Mid-20th century (blinding conventions formalised 1940s–1960s)	1963 (formalized in Campbell & Stanley)
صاحب الطريقة	Established practice in experimental social science and clinical research; codified by Campbell & Stanley (1963) and Shadish, Cook & Campbell (2002)	Donald T. Campbell and Julian C. Stanley
النوع	Controlled field experiment with partial blinding	Experimental / quasi-experimental research design
المصدر التأسيسي	Shadish, W. R., Cook, T. D., & Campbell, D. T. (2002). Experimental and Quasi-Experimental Designs for Generalized Causal Inference. Houghton Mifflin. ISBN: 978-0395615560	Campbell, D. T., & Stanley, J. C. (1963). Experimental and Quasi-Experimental Designs for Research. Rand McNally.
الأسماء البديلة	single-masked field experiment, field experiment with single blinding, single-blind natural-setting trial	pretest-posttest design, before-after design, pre-post design, two-wave experimental design
ذات صلة	6	5
الملخص	A single-blind field experiment combines real-world experimental conditions with partial blinding: either participants or outcome assessors — but not both — are kept unaware of treatment assignment. This design reduces demand characteristics or observer bias while preserving ecological validity, making it a practical middle ground when full double-blinding is logistically infeasible in naturalistic settings.	The pretest-posttest experimental design measures participants on the outcome variable before and after treatment, typically with random assignment to treatment and control groups. The difference between pre- and post-scores isolates the treatment effect from baseline variation, making this one of the most widely used frameworks in experimental and quasi-experimental research across education, psychology, medicine, and the social sciences.