পদ্ধতির তুলনা করুন

	ডাবল-ব্লাইন্ড সলোমন ফোর-গ্রুপ ডিজাইন	প্রিটেস্ট-পোস্টটেস্ট পরীক্ষামূলক নকশা
ক্ষেত্র	পরীক্ষামূলক নকশা	পরীক্ষামূলক নকশা
পরিবার	Process / pipeline	Process / pipeline
উদ্ভবের বছর	1949 (Solomon design); double-blind blinding integrated in 20th-century experimental practice	1963 (formalized in Campbell & Stanley)
প্রবর্তক	Richard L. Solomon (base design); double-blind protocol is a general methodological standard	Donald T. Campbell and Julian C. Stanley
ধরন	True experimental design	Experimental / quasi-experimental research design
মৌলিক উৎস	Solomon, R. L. (1949). An extension of control group design. Psychological Bulletin, 46(2), 137–150.	Campbell, D. T., & Stanley, J. C. (1963). Experimental and Quasi-Experimental Designs for Research. Rand McNally.
অপর নাম	double-blind S4GD, blinded Solomon design, double-blind four-group design, Solomon four-group with double-blind	pretest-posttest design, before-after design, pre-post design, two-wave experimental design
সম্পর্কিত	5	5
সারসংক্ষেপ	The double-blind Solomon four-group design combines Richard Solomon's classic four-group structure — which isolates pretest sensitization effects — with double-blind blinding, ensuring that neither participants nor outcome assessors know group assignments. This combination yields high internal validity by controlling simultaneously for testing effects, expectancy bias, and experimenter influence, making it one of the most rigorous true experimental designs available.	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.