قارن الطرق

	التجربة المعشاة ذات الشواهد (RCT)	تصميم الدراسة المتقاطعة
المجال	التصميم التجريبي	التصميم التجريبي
العائلة	Hypothesis test	Hypothesis test
سنة النشأة	1948	1960
صاحب الطريقة	James Lind (early precursor, 1747); modern formulation: Austin Bradford Hill & Medical Research Council (1948)	Early formalized in clinical research literature; widely used since mid-20th century
النوع	Interventional comparative study	Within-subject repeated-measures design
المصدر التأسيسي	Schulz, K.F., Altman, D.G., Moher, D., for the CONSORT Group (2010). CONSORT 2010 Statement: Updated Guidelines for Reporting Parallel Group Randomised Trials. BMJ, 340, c332.	Senn, S. (2002). Cross-over Trials in Clinical Research (2nd ed.). Wiley. ISBN: 978-0471496533
الأسماء البديلة	RCT, randomised controlled trial, clinical trial, Randomize Kontrollü Çalışma (RCT) Tasarımı	within-subject crossover, cross-over design, AB/BA design, Çapraz Desen (Crossover Design)
ذات صلة	7	6
الملخص	A randomized controlled trial (RCT) is the gold standard experimental design in clinical and health research, in which participants are randomly allocated to a treatment group or a control group so that the effect of an intervention can be measured with the highest possible degree of internal validity. The modern parallel-group RCT was formalized by Austin Bradford Hill and the Medical Research Council in their landmark streptomycin trial of 1948, and its reporting is governed today by the CONSORT 2010 guidelines (Schulz et al., 2010).	A crossover design is an experimental design in which each participant receives all treatments under investigation, but in a different sequence and across separate time periods. Each subject thus acts as their own control, which substantially reduces between-subject variability and allows efficient treatment comparisons with smaller sample sizes. The approach has been central to clinical pharmacology and comparative research since the mid-20th century, with foundational methodology codified by Senn (2002) and Jones & Kenward (2014).