The induction period is a very important time in the career of a teacher and has a long-term influence on the teacher's professional development, efficacy, job satisfaction and the length of his/her career. One of the key roles in this period is played by the trainee's mentor. This paper presents the results of the extensive project "Partnership of Faculties and Schools", carried out at the Pedagogical Faculty, University of Ljubljana, with the financial support of the European Social Fund and the Slovenian Ministry of Education, Science and Sport. We studied an induction project involving 361 teacher trainees and 331 mentors. The study reveals the trainees' expectations towards their mentors and the mentors' and trainees' evaluations of how the mentor aids a teacher trainee in developing their competences. (Contains 1 figure and 1 table.)