<unk>  is an experimental<unk>  for randomized clinical trials proposed by Harvard School of Public Health statistician Marvin<unk>  (1927-2014). In this<unk> , patients are randomized to either the treatment or control group before giving informed consent. Because the group to which a given patient is assigned is known, consent can be sought conditionally.
Zelen's design
Wiley protocol
CHIVA method
NDR Method
PRECEDE–PROCEED model
Independent SAGE
Shettles method
Montreal experiments