There are few errors committed on part of the respondents during interviews which could bias the results. The aim of the researcher should be to minimise the probability of such mistakes.
It is because of respondents’ poor recall that they may give incorrect answers. Such questions should be avoided that put a strain on respondents’ mind and he/she feels stress while answering. Any inconsistency should be cross checked regarding respondents’ exaggerated and dishonest answers. It may also happen that the question may not be clear to the respondent and may get inhibition in asking again thus giving wrong answer. In such a case the investigator should be making sure that the respondents clearly understand the content and context of the questionnaire.
There are times when respondents do not understand the purpose of the study clearly. Therefore, to avoid such a problem the objectives of the survey should be clearly made to understand so that there is no scope for ambiguity left. The identity of the interviewer and sponsor, requirement from the respondent should be explained before the interview. Sometimes the respondents may give answers that are expected by the researchers and it may get prejudiced as the interviewees may not like to be discourteous. Therefore, a good environment should be created for the interview to be conducted properly giving comfort to the respondents. This would give fair response to the interviewers.