You send them a short reminder e-mail. This letter emphasizes why it is important
to get their feedback as quickly as possible (e.g., before the school year ends
and while they still have a fresh memory of their Newslink experience). The
letter also repeats the Internet link to the survey and whom to contact for
help. For those who do not respond after an additional week, you decide you
will send out one more letter by both mail and e-mail, and that this letter
will emphasize the usefulness of the responses already received and the opportunity
to win the science encyclopedias. This will be your last contact because the
school year will be ending and most teachers will not be available during the
summer.