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Advantages - considerable savings of time and money, convenience for respondents because they determine when to answer the questions, greater assurance of anonymity, standardized wording, no interviewer bias, access to respondents not readily reached in person by interviewers, opportunity for respondents to gather information needed to complete the questionnaire. Quantitative data that is viewed as accurate.

Disadvantages - No control over who responds, low response rates are typical, unless all respond there is no assurance of an unbiased sample, no control over the conditions under which the questionnaire is completed,  no assurance that the intended respondent completed the questionnaire, lack of flexibility in how questions are asked if the respondents doesn't understand the questions, difficulties in getting and maintaining current mailing lists.