قارن الطرق

	تجربة معملية محظورة - تصميم القطاعات العشوائية في البيئات المعملية	تجربة المختبر
المجال	التصميم التجريبي	التصميم التجريبي
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1926–1935	17th century (natural science); ~1879 onward (behavioral/social science)
صاحب الطريقة	Ronald A. Fisher	Francis Bacon, Robert Boyle (early scientific method); formalized in social science by Wilhelm Wundt (1879 psychology lab) and Ronald A. Fisher (20th-century design principles)
النوع	Controlled experimental design with blocking	Experimental quantitative design
المصدر التأسيسي	Fisher, R. A. (1935). The Design of Experiments. Oliver and Boyd.	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	blocked lab experiment, laboratory randomized block design, RBD laboratory study, blocked within-lab experiment	lab experiment, controlled experiment, true experiment, lab study
ذات صلة	5	5
الملخص	A blocked laboratory experiment is a controlled laboratory study in which experimental units are grouped into homogeneous blocks before treatment assignment, and treatments are then randomly assigned within each block. Blocking removes the influence of a known nuisance variable — such as participant batch, equipment run, or testing day — from the error term, increasing the precision of treatment comparisons without expanding sample size.	A laboratory experiment is a research design in which the investigator systematically manipulates one or more independent variables under tightly controlled conditions, randomly assigns participants to conditions, and measures the effect on dependent variables. By maximizing internal control, the laboratory experiment is the gold standard for establishing cause-and-effect relationships. It is the backbone of experimental psychology, cognitive science, pharmacology, and many social sciences.