Find out what students really think about their instructor. This template covers teacher competency, course difficulty and intrigue, and the applicability of homework.
Try to use email invitations if possbile to gain further analysis based on student/grade
If you wish to use web link surveys because of anonymity, create a separate survey for each instructor/class period if doing this school wide. This will enable you to combine results in spreadsheet format
Customize as needed
Send this out no later than 3 weeks before the end of the semester to ensure students are still engaged in class and not looking forward to the break