The aim of the project is to describe in detail how power is negotiated, used, and perceived by student teachers and their pupils on the level of lower secondary schools (ISCED 2A) whom the student teachers teach during their one semester long teaching practice. To deal with complex phenomenon of power, a design of mixed methods research was applied. The main research question was: How does a process of power negotiation take place between student teachers and their students in classes in Czech lower secondary schools during their long-term teaching practice? The qualitative part was based on video-studies of eight student teachers’ teaching in the course of one semester, on semi-structured interviews with these student teachers, and on reflective diaries that were written by these student teachers during their teaching practice. Quantitative data bring results of the Power Bases: Version for Student Teachers questionnaire into our study. This questionnaire was distributed to the students from eight classes where the student teachers from our research sample were teaching.