In vocational education, teaching and learning are expected to take place in the different learning arenas; schools and workplaces. In such a dual school system, the question of transfer is vital, i.e. how to use knowledge learned in previous situations in new situations. This article is an empirical contribution to research concerning transfer, by means of results from semi-structured group interviews with teachers and supervisors who educate students in the Energy program and the Industry program in Swedish upper secondary school. The interviews were analysed by analyses of narratives. The results show four themes of transfer in the interviews: (1) transfer of basic knowledge, (2) transfer of principles and skills, (3) transfer of written materials and real life and (4) transfer of experiences. The results also show three factors that are crucial in order to create possibilities for transfer: (1) communication, (2) financial resources and (3) reflection. These factors demand close cooperation between the teachers and supervisors during the students' vocational education.