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	Laboratorieexperiment	Faktoriell experiment
Ämnesområde	Försöksplanering	Försöksplanering
Familj	Process / pipeline	Process / pipeline
Ursprungsår	17th century (natural science); ~1879 onward (behavioral/social science)	1926–1935
Upphovsperson	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)	Ronald A. Fisher
Typ	Experimental quantitative design	Quantitative experimental design
Ursprungskälla	Shadish, W. R., Cook, T. D., & Campbell, D. T. (2002). Experimental and Quasi-Experimental Designs for Generalized Causal Inference. Houghton Mifflin. ISBN: 978-0395615560	Fisher, R. A. (1935). The Design of Experiments. Oliver and Boyd.
Alias	lab experiment, controlled experiment, true experiment, lab study	factorial design, factorial ANOVA design, multi-factor experiment, crossed-factor design
Närliggande	5	6
Sammanfattning	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.	A factorial experiment is an experimental design in which two or more independent variables (factors) are manipulated simultaneously, and every combination of their levels is tested. Introduced by Ronald Fisher in the 1920s–1930s, it is the standard approach whenever a researcher needs to detect not only the main effect of each factor but also whether the effect of one factor depends on the level of another — the interaction effect.