题目要求：

Many students are required to evaluate their teachers but some teachers complain that these evaluations are unfair and can in some cases lead to the dismissal of a teacher. In your opinion, is the students' evaluation of their teacher a worthwhile exercise?

参考范文：

Difficulties with Students' Evaluation of Their Teacher

The students' evaluation of their teacher can be a very subjective proposition because it depends a lot on how the evaluation is made and how it is subsequently used. I believe most teachers would like to know how effective their teaching really is and how it benefits their students.

A difficulty with students' evaluation of their teacher is finding the right formulae to achieve an honest, constructive and independent response. The size and makeup of the class can be a reason for this difficulty. The larger the class the more likely will be the range of ability in the students. That fact Limits the interaction between the teacher and individual students and automatically influences how students will perceive the effectiveness of their teacher. Smaller classes are much less likely to have a great range of ability in the students and their evaluation of their teacher will tend to be more consistent. A crucial aspects with students' evaluation is how it is used. If it is a formal part of the school's program it needs to be used constructively in liaison with the teachers for the benefit of both teachers and students.

For students' evaluations to be worthwhile they need to be independent and honest. Negative comments from students, delivered with sincerity, can be very valuable in helping teachers change their teaching methods and making them more effective. Biased evaluations can lead to misinterpretation and less productive outcome.