Background and Aim: University teachers are among the main pillars of higher educational system and their evaluation is constantly done through different ways including students' evaluation. While some teachers are opposed to evaluation by weak students, the present study was designed and carried out in Birjand University of Medical Sciences to determine the relationship between teachers' evaluation scores and students with different educational development.

  Materials and Methods: In this cross- sectional, descriptive and analytical study, which was performed at Birjand University of Medical Sciences in 2007, sixty-three faculty members were selected conducting a poll, and 2700 questionnaires were filled in by all medical students. The means of data collection were the questionnaires whose validity and reliability had been confirmed by the university's Education Development Center. The obtained data was analyzed by SPSS software (version 11.5) at the significant level P<0.05.

  Results: Mean evaluation scores by advanced, average and weak students were 55.59±11.46, 55.70±12.49, and 55.51±12.23 respectively (P=0.96). In surveying different aspects which were evaluated there was a significant difference between advanced students and weak ones regarding teachers' dignity score (P=0.03).

  Conclusion: Regarding that a significant difference between faculty members' evaluation scores and students with different educational development levels was not observed, it seems that educational development of students has no effect on their evaluation and, therefore, this variable can not be considered as favoritism in the evaluation of teachers. The difference observed in the domain of professorial dignity can emphasize the necessity of better judgment on the part of professors in their dealing with students.