Questionnaires offer the following advantages:

• Less personal than interviewing, their anonymity can encourage more honest answers.
• Works well to reach respondents who are widely scattered, or live considerable distances away.
• Provides information from those unlikely to attend meetings and workshops.
• Permits expansion of the mail list.
• Can be used for statistical validation.
• Allows results to be extrapolated by subgroups.
• Allows the respondent to fill out at a convenient time.
• More economical and less labour intensive than interviews and telephone surveys as they provide larger samples for lower total costs.