If you're doing a snail mail survey, trade up a bit: Anything that distinguishes the survey from direct marketing will increase your success rate. First-class postage is more expensive but also more effective than third-class, Pingitore says. Use a laser printer to make the address look hand-printed. Make the form attractive with white space, large fonts and a clear description of how the information will be used. Allowing respondents to remain anonymous also helps, but if personal information is collected, you should clearly describe how it will be used.

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