Telephone questionnaires are generally used after a focus group has been held although it is also used when you need to get information very quickly. Another use of a telephone questionnaire is to finely tune a final mailed questionnaire to make sure the respondants don't miss-interpret a question as well as to ensure that all the questions needed are in the questionnaire. This depends upon the total size of your prospect market, the number of unique segments of that market, and you're anticipated response rate to the questionnaire. Generally, a sample of 5,000-10,000 questionnaires will provide enough responses to generate projectable results. However, there are other incentives as well such as making a donation to a charity or donating a book to a library.
Market research can be a powerful marketing tool.
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