So sánh phương pháp

	Thử nghiệm thực địa sơ bộ	Thử nghiệm ngẫu nhiên theo cụm
Lĩnh vực	Thiết kế thí nghiệm	Nghiên cứu lâm sàng
Họ	Process / pipeline	Process / pipeline
Năm ra đời	Mid-20th century (systematised 1960s–1990s)	1999-2000
Người khởi xướng	Rooted in Campbell & Stanley (1966) experimental design tradition; formalised in clinical and social research through the 20th century	Campbell, Grimshaw, Elbourne et al.
Loại	Experimental design	Research Design
Công trình gốc	Campbell, D. T., & Stanley, J. C. (1966). Experimental and quasi-experimental designs for research. Rand McNally. ISBN: 978-0395307878	Campbell, M. K., Grimshaw, J. M., & Elbourne, D. R. (2000). Intracluster correlation coefficients in cluster randomized trials: empirical insights into how should they be reported. BMC Medical Research Methodology, 4, 30.
Tên gọi khác	pilot field trial, small-scale field experiment, feasibility field experiment, exploratory field experiment	CRT, cluster RCT, cluster trial, group randomization
Liên quan	3	3
Tóm tắt	A pilot field experiment is a small-scale, preliminary version of a planned full field experiment conducted in a naturalistic setting. It tests whether the intervention, randomisation procedure, measurement instruments, and logistical protocols are feasible before committing to a full-scale study. Results inform sample size calculations, refine treatment protocols, and identify procedural risks — saving resources and improving the quality of the definitive study.	A cluster randomized trial (CRT) randomizes intact groups—schools, clinics, villages, or hospital wards—rather than individuals. Developed by Campbell, Grimshaw, and colleagues in the late 1990s to address real-world settings where intervention delivery or contamination occurs at the group level, CRTs are now standard for evaluating population-level, community-based, and policy interventions.