Encourage them to watch for the survey e-mail and complete the survey as soon as possible. Instructors who explain why they are using midterm evaluations and how they plan to use the data, find that they have a greater number of surveys returned.
Remind students to complete the survey if they haven't yet.
Some instructors offer 1 extra credit point if a certain percentage of students complete the evaluation. MoCAT will show instructors the response rate of a survey, but not the students who completed it.