ABSTRACT
One of the important aspects of education is evaluation which is influenced by various factors. To assess teachers' effectiveness on student evaluation of teacher and course. 290 students of Qazvin medical university [2000-2001] in four classes with four different teachers took part in this research. They filled in a questionnaire containing 10 questions at the beginning of semester before instruction and at the last session. The results indicated that students selected the choice "very much" more frequently at the last session in comparison with the first day of the semester. The score for judgment on a good teacher [characteristics of teachers and criteria of a good teacher] was 4.5 times higher in comparison with the beginning of the semester. Teacher can be considered as an effective factor for students' concept toward the course and themselves