A self-report measure may be inappropriate when the experimenter has concerns about social desirability bias.
Self-report measure as a tool for conducting surveys is often flawed due to the social desirability bias, which refers to the tendency of participants to over-emphasize socially desirable attributes and downplay undesirable ones.
This tendency is most prevalent in surveys related to personal abilities, drug use, and sexual behavior. For example, on questions regarding the use of drugs like marijuana, respondents may be inclined to deny any use or to try and rationalize their usage.
This undermines the accuracy of the data collected and interferes with the interpretative processes.
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