The purpose of this study is to achieve deeper knowledge of what experiences and perceptions school librarians who work in high school libraries have of media and information literacy (MIL). School librarians have always struggled to assert themselves and their skills among the teachers. When MIL was launched it was very well recieved by teachers and school librarians. Will the collaboration between teachers and school librarians improve due to MIL? The empirical material has been collected through semistructured interviews with eight school librarians who work with high school students. They gave their opinions about what is included in the concept of MIL and how it differs from the former concept; information literacy (IL) and how MIL work as a phenomenon. Furthermore, the informants answered questions about how they used MIL in their everyday teaching. The theoretical framework used to analyze the results from the interviews is called ”Diffusion of Innovations” by Everett M. Rogers. Rogers’ theory shows how fast an innovation is established due to different factors. It seems like the new concept of MIL should be accepted rather rapidly since the innovation met most of the beneficial criterias. Our major finding shows no particular change in the way librarians work with the new concept of MIL in comparison to the former concept. Since this innovation has not yet reached the confirmation step of Rogers’ innovation-decision process, it cannot be considered as fully executed.