Research concerning the supervisor role in separate educational programmes has been undertaken, but cross-professional studies are few. The aim of this study was to explore the lived experience of supervising mentors in Sweden during the practice-based, off-campus sections of the education in teaching, nursing, and social care. The study used a participatory phenomenological approach in which four researchers and nineteen supervising mentors worked together in the research process which was accomplished in four different phases. The data collecting method used was interview. The results constituted a main essence entitled "Struggle of power and control of professional quality enhancement" built upon four themes: "Constitutes a motivating force", "Feelings of responsibility", "Feelings of frustration" and "Wishes for alteration". Conclusions from the study are that communication, information and contact between the professionals in the fields and university teachers need to be strengthen to keep up supervising mentors' motivating force and to give them support.