قارن الطرق

	تجربة ميدانية مزدوجة التعمية	التجربة الميدانية أحادية التعمية
المجال	التصميم التجريبي	التصميم التجريبي
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1960s onward (field experiment tradition); double-blind controls applied from 1970s in social and policy field trials	Mid-20th century (blinding conventions formalised 1940s–1960s)
صاحب الطريقة	Fisher, R. A. (randomized field trials); double-blind practice traced to 19th-century clinical research, formalized for field settings by Campbell & Stanley (1963)	Established practice in experimental social science and clinical research; codified by Campbell & Stanley (1963) and Shadish, Cook & Campbell (2002)
النوع	Experimental design	Controlled field experiment with partial blinding
المصدر التأسيسي	Gerber, A. S., & Green, D. P. (2012). Field Experiments: Design, Analysis, and Interpretation. W. W. Norton. ISBN: 978-0393979954	Shadish, W. R., Cook, T. D., & Campbell, D. T. (2002). Experimental and Quasi-Experimental Designs for Generalized Causal Inference. Houghton Mifflin. ISBN: 978-0395615560
الأسماء البديلة	double-masked field trial, double-blind naturalistic experiment, blinded field study, DB field experiment	single-masked field experiment, field experiment with single blinding, single-blind natural-setting trial
ذات صلة	5	6
الملخص	A double-blind field experiment combines the high external validity of a real-world field setting with double-blind masking, in which neither the participants nor the personnel delivering the treatment know who has been assigned to the treatment or control condition. This design controls simultaneously for participant expectation effects and for experimenter/enumerator demand effects, making it one of the most rigorous tools available for causal inference outside the laboratory.	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.