At my school, students have the ability to log on to the campus portal and submit an electronic evaluation of each course and instructor. The frustrating thing as the instructor, though, is that the predetermined statements to which students simply agree or disagree do not allow for further qualitative responses.
So for example, one statement might be "This course was valuable to me." A student might strongly disagree, but that response alone gives no clue as to how the instructor can improve the course.
When writing evaluations for students to fill out, it is critical that the response - whatever it may be - be useful in improving teaching style and curricula