Greater depth of response: Telephone interviews almost always result in more
complete information, since people often do not fill out questionnaires completely or
accurately, and may provide incomplete or cryptic answers to open-ended questions.
Some of the information your community is hoping to learn about OST activities may be
complex. A trained telephone interviewer can probe for in-depth responses and make
sure people answer all relevant questions, thus the problems with missing data that are
common in self-administered surveys are virtually eliminated.