Between 1998 and 2002 an estimated 250 mentoring programmes were started in Dutch secondary vocational education in order to decrease motivational problems and drop-out rates, especially among youngsters from ethnic minorities. Currently there are only two schools in secondary vocational education that include mentoring as part and parcel of their system of guidance and counselling. The vast majority of mentoring programmes do not run for more than two years. The main reason for this seems to be the absence of a vision of mentoring that explains how and why it works--a vision that is shared by mentors, teachers and school managers. In this article, data presented from four different case studies on mentoring in Dutch vocational education showed that the absence of a shared vision resulted in vague, often contradictory, and conflicting perspectives and actions taken by all parties involved in the mentoring scheme. In fact, because no synergy existed, the mentoring programmes had a marginal position in schools and disappeared as soon as external funding stopped. (Contains 3 tables and 1 figure.)