This bachelor's thesis is an investigation of how four principals at communal upper secondary schools in Gothenburg implements the school librarian in the school activities and how they perceive the school librarian as a pedagogical resource. Since 2018 it is specified in the curriculum (Lgy11) that the principal is responsible for the usage of the library. The principal is to make sure that teachers and students have the opportunity to work with the school library in an educative way. However, none of the laws or curriculums state that the school library needs to be staffed with a qualified librarian. Therefore, the purpose of this thesis is to investigate how the principals view the profession of the school librarian, how the principals view the school librarian as a pedagogical resource and how they ensure the collaboration between school librarian and teacher. To gather the empirical material for this study I used qualitative semistructured interviews and to analyze the results I have used Loertschers taxonomy for school leaders. The results of the interviews show that the principals have a very positive attitude towards the school librarian and are unanimously convinced of their value as a pedagogical resource. However, only one of them purposefully enables collaboration between librarians and teachers as well as engaging them in school activities. Obstacles mentioned are lack of time, strict schedule and that the librarians do not promote themselves enough at the schools.