Important information about the clinical education can be revealed by nursing students' initial expectations and final evaluation of mentors' competences, and mentor's self-evaluation of their competences. The aim of this study was to examine whether these constructs can be used for evaluating the atmosphere in clinical education. This was a nonexperimental prospective study. Data were collected between January and April 2012, in 12 clinics at the University Hospital Osijek. The participants were undergraduate nursing students in years 1, 2, and 3 (n = 150) and their mentors (n = 35) at the Faculty of Medicine, University of Osijek, during the academic year of 2012/2013. The instrument was a modified version of the questionnaire taken from The Nursing Clinical Teacher Effectiveness Inventory (NCTEI). Prior to clinical practice, the students evaluated the desirability of each competence expected from a mentor; after the clinical practice, the students estimated how often their mentor possessed and applied those competences. Mentors have evaluated their own competences according to the same items. Comparison of students' expectations and estimates shows significantly higher expectations of first and third year students (p<0.001). Mentors' self-assessed competences, compared to students' evaluations, were rated significantly higher by mentors of all three years (p<0,001). The comparison of nursing students' initial expectations and final evaluation of mentors' competences, and mentor's self-evaluation of their competences, when they are significantly different, can provide relevant information about potential problem in clinical education.