<unk>  includes the design of all information-gathering exercises where variation is present, whether under the full control of the<unk> r or not. (The latter situation is usually called an observational study.) Often the<unk> r is interested in the effect of some process or intervention (the 'treatment') on some objects (the 'experimental units'), which may be people.<unk>  is thus a discipline that has very broad application across all the natural and social sciences.
Design of experiments
Agent study
Clinical trials terminology
Operationalizing Clinical Trials
Action study
Block design
Risk factor template
Diagnostic Criteria