قارن الطرق

	تجربة عشوائية متصالبة محكومة	التجربة العشوائية ذات العوامل المتعددة (Factorial Randomized Controlled Trial)
المجال	التصميم التجريبي	التصميم التجريبي
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1960s (Grizzle 1965 for statistical foundations); widely used in clinical research since the 1970s	1926 (Fisher factorial foundations); 2000s–2010s (clinical factorial RCT formalization)
صاحب الطريقة	Early formalized by statisticians including Bradford Hill and colleagues in clinical trials; theoretical framework developed by Grizzle (1965) and later Senn (2002)	R. A. Fisher (factorial design foundations); adapted into clinical trials via MOST framework (Collins et al., 2014)
النوع	Experimental within-subject design	Experimental trial design
المصدر التأسيسي	Senn, S. (2002). Cross-over Trials in Clinical Research (2nd ed.). Wiley. ISBN: 978-0471496533	Collins, L. M., Dziak, J. J., Kugler, K. C., & Trail, J. B. (2014). Factorial experiments: Efficient tools for evaluation of intervention components. American Journal of Preventive Medicine, 47(4), 498–504.
الأسماء البديلة	crossover RCT, crossover trial, within-subject RCT, AB/BA crossover design	Factorial RCT, factorial trial, multi-factor RCT, factorial experiment with randomization
ذات صلة	5	6
الملخص	A crossover randomized controlled trial (crossover RCT) is an experimental design in which each participant receives all study interventions in a randomized sequence, separated by a washout period. Because every participant serves as their own control, within-subject variability is eliminated from the treatment comparison, yielding greater statistical power per participant than a parallel-group RCT of equal size.	A factorial randomized controlled trial (factorial RCT) is an experimental design in which participants are randomly assigned to every possible combination of two or more independent factors (treatments or intervention components) simultaneously. This allows researchers to estimate the main effect of each factor and their interactions within a single, efficient trial, rather than running separate experiments for each factor.