The essential characteristic of interviewers is that their presence in the data collection process must not have any effect on the responses given to questionnaire items.

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This is because any effect that interviewers may have on the responses given to questionnaire items would result in biased data, thereby rendering the results of the survey unreliable. Interviewers must therefore strive to be neutral and objective in their interactions with respondents to ensure the validity of survey results.

The Essential Characteristic of Interviewers Is That Their Presence in the Data