A blind or blinded experiment is an experiment in which information about the test that might lead to bias in the results is concealed from the tester, the subject, or both until after the test. Bias may be intentional or unconscious. If both tester and subject are blinded, the trial is a double-blind trial. Blind testing is used wherever items ar...
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http://en.wikipedia.org/wiki/Blind_experiment
In a blind experiment, the subjects do not know whether they are in the treatment group or the control group. In order to have a blind experiment with human subjects, it is usually necessary to administer a placebo to the control group.
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https://www.encyclo.co.uk/local/20687
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