directed study
— Noun
– English
～ a course of study that is supervised and controlled by a specialist in the subject; "he registered for directed study"; "he got credit for directed study"; "he did directed study"
double-blind study
— Noun
– English
～ an experimental procedure in which neither the subjects of the experiment nor the persons administering the experiment know the critical aspects of the experiment; "a double-blind procedure is used to guard against both experimenter bias and placebo effects"