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	Cluster Randomized Control Group Experimental Design	Randomizowane badanie kontrolowane z grupowym doborem próby
Dziedzina	Planowanie eksperymentów	Planowanie eksperymentów
Rodzina	Process / pipeline	Process / pipeline
Rok powstania	1990s (formal methodology development)	1978–1980s
Twórca	Murray, D. M.; Donner, A. and Klar, N. (systematic formalization)	Cornfield (1978); systematised by Donner and colleagues (1980s)
Typ	Experimental design	Experimental design
Źródło pierwotne	Donner, A., & Klar, N. (2000). Design and Analysis of Cluster Randomization Trials in Health Research. Arnold. ISBN: 978-0340691533	Donner, A., & Klar, N. (2000). Design and Analysis of Cluster Randomization Trials in Health Research. Arnold. ISBN: 978-0340652978
Inne nazwy	CRCT with control group, group-randomized trial, cluster RCT control group design, community randomized controlled trial	cluster RCT, group-randomized trial, community randomized trial, cluster-randomized experiment
Pokrewne	6	4
Podsumowanie	A cluster randomized control group experimental design randomly assigns intact groups (clusters) — such as schools, clinics, or communities — rather than individuals to treatment or control conditions. At least one cluster group receives no active intervention, serving as the control. This design is essential when individual randomization is impractical or contamination between participants in close proximity is likely.	A cluster randomized controlled trial (cluster RCT) is an experimental design in which intact social or organisational groups — such as schools, clinics, villages, or workplaces — are randomly assigned to treatment conditions rather than individual participants. Outcomes are still measured at the individual level, but the unit of randomization is the cluster. This design is essential when an intervention is delivered to whole groups, when there is a risk of contamination between participants in the same setting, or when individual randomization is logistically or ethically impractical.