The aim of this thesis is to deepen our knowledge of librarians' experiences of working with projects. Focus is on the characteristics of successful projects implemented in public libraries and how they are assimilated into the regular and ordinary activities of the library. A grounded theory approach is adopted and complemented with theory on learning and change in organizations and from new public management. The study is based on semi-structured qualitative interviews with five librarians. The result reveals that librarians enjoy working in projects. The possibility of being able to develop new teaching tools, create new relationships and to form new network alliances between library, schools, associations and the business community increase the librarians' motivation to initiate new projects. Successful projects are defined by number of participants, cost efficiency, the opportunity to create new knowledge. Project inclusion in regular programs in libraries usually an objective and is likely to be pre-planned in advance.