Investigator collects the information personally by responding to the person directly. Indirect oral investigation is done to collect the information by means of various third parties or witnesses. News Papers, magazines and reports are used to collect the data for different segments. Questionnaire is the most important part for this kind of survey methods as in this there is need of preparing some useful questions that relates to the area and ask to provide feedback or fill the questionnaire.
A questionnaire is a set of questions for gathering information from individuals. You can administer questionnaires by mail, telephone, using face-to-face interviews, as handouts, or electronically (i.e., by email or through Web-based questionnaires).
Personal interviews are highly susceptible to inadvertent “signaling” to the respondent. Although an interviewer is looking to get at the truth, he or she may have a significant interest in a positive consumer response. Unconsciously, then, he or she may inadvertently smile a little when something positive is said and frown a little when something negative is said. Consciously, this will often not be noticeable, and the respondent often will not consciously be aware that he or she is being “reinforced” and “punished” for saying positive or negative things, but at an unconscious level, the cumulative effect of several facial expressions are likely to be felt. Although this type of conditioning will not get a completely negative respondent to say all positive things, it may “swing” the balance a bit so that respondents are more likely to say positive thoughts and withhold, or limit the duration of, negative thoughts.