If not, the interview is politely terminated and the amount of wasted time limited. With a mail survey, you re still paying to print and mail the questionnaire and receive the response even if the respondent isn t the type of person you want to include. When to use mail. Not at all. When you have an important population and you re concerned about perceived invasion of privacy.
Few people have strong negative reactions to getting a questionnaire in the mail.
A phone call can sometimes evoke a more severe reaction. With typical donors, the possibility of upsetting two or three pales in comparison to the value of the information you re getting. If you re talking about major donors, however, the risk of upsetting even one or two can mean substantial loss to your organization. Mail surveys will minimize the risk of any strong negative reactions of this type. When you need to show people something, it s tough to do by phone.