One more term.

1. ऐसे परीक्षण अध्ययनों में परिणाम या आंकड़े आने तक न तो अनुसंधानकर्त्ता को यह पता होता है कि वह किन रोगियों पर परीक्षण कर रहा है और न ही रोगी को पता होता है कि वे किस अध्ययन दल में शामिल हैं।

2. In a double-blind experiment, neither the individuals nor the researchers know who belongs to the control group and the experimental group. Only after all the data has been recorded (and in some cases, analyzed) do the researchers learn which individuals are which. Performing an experiment in double-blind fashion is a way to lessen the influence of the prejudices and unintentional physical cues on the results (the placebo effect, observer bias, and experimenter's bias). Random assignment of the subject to the experimental or control group is a critical part of double-blind research design.

3. Double-blind: Term used to described a study in which both the investigator or the participant are blind to (unaware of) the nature of the treatment the participant is receiving. Double-blind trials are thought to produce objective results.

जिसके विषय में दोनों ही पक्षों को मालूमात न हो।