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	Experimentell design med kontrollgrupp	Faktoriell experiment
Ämnesområde	Försöksplanering	Försöksplanering
Familj	Process / pipeline	Process / pipeline
Ursprungsår	1935 (Fisher); 1963 (Campbell & Stanley codification)	1926–1935
Upphovsperson	Ronald A. Fisher; systematised by Donald T. Campbell & Julian C. Stanley	Ronald A. Fisher
Typ	Experimental research design	Quantitative experimental design
Ursprungskälla	Campbell, D. T., & Stanley, J. C. (1963). Experimental and Quasi-Experimental Designs for Research. Rand McNally.	Fisher, R. A. (1935). The Design of Experiments. Oliver and Boyd.
Alias	controlled experiment, true experimental design, randomized controlled design, treatment-control design	factorial design, factorial ANOVA design, multi-factor experiment, crossed-factor design
Närliggande	4	6
Sammanfattning	Control group experimental design is a fundamental experimental structure in which participants are assigned to at least two groups — a treatment group that receives the intervention and a control group that does not — so that the effect of the intervention can be isolated by comparing outcomes across groups. Randomisation of assignment strengthens causal inference by balancing known and unknown confounders.	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.