The instructor should leave the room while students complete their evaluations. In many departments, students perform these functions. The person administering the questionnaire should point out any open-ended questions or space provided for comments. This approach will increase the amount of student feedback. Students should be given sufficient time to complete the form.
Most forms take fifteen to twenty minutes to complete.
In addition, departments may wish to leave space for one or two optional questions on the forms so that instructors can choose items that seem to be particularly relevant to their subject matter and teaching methods. At least ten students are needed to provide minimally sound data. Classes over twenty will be most reliable. Data must be collected over time. For decision-making purposes, research suggests gathering data from five courses of at least fifteen students.