In a (single) Blind study, the participants don’t have all the info (for example, the brand is not shared with respondents, or in the case of test vs. control groups, the respondents don’t know which group they’re in). In a Double-Blind study, both the respondents and those conducting the study don’t have all the info (neither the interviewers nor the respondents know which brand is sponsoring the study, or the observers of a test vs. control scenario also don’t know which group the respondent was assigned to, but those performing the data analysis do). In a Triple-Blind study, the respondent, interviewer or observer, and those performing the data analysis don’t have all the info, thus eliminating the possibility that biases or assumptions from any of these three groups can affect the outcome of the study.