In recent decades, mental illness has increased in Sweden, and in parallel to this there has been an increase in unemployment. This implies that it is harder for people who have been away from employment for long periods due to ill health to return to work. The purpose of this study was to examine the work situation of people with mental illness who had undergone prevocational training, and to identify psychosocial factors relevant to their current work ability. The aim was also to describe how those who had undergone prevocational training perceived that it had affected their work ability. The study involved 19 participants who were interviewed and assessed with the Worker Role Interview, and an open question was asked about how they perceived that the prevocational training had affected their current work ability. The interview revealed that three of the participants were on sick leave, one was seeking a job, and 15 were working or studying. The results showed that the participants generally had support to acquire, return to, or continue employment concerning the psychosocial factors identified with the WRI. The WRI items showing the strongest support concerned the participants’ understanding of their abilities and limitations, their belief in their ability to work, and their understanding of what the working role involved. All participants perceived that the prevocational training had had a significant impact on their ability to return to work.