Theorists and practitioners have long recognised that working with trauma clients can trigger reactions in the therapist similar to those experienced by the client. Nevertheless, research in this area has been lacking. One obstacle has been confusion regarding key terms. Vicarious traumatisation is the most appropriate concept given that it relates specifically to trauma work, incorporates intrinsic and extrinsic factors, and can be located within the framework of the constructivist self-development theory. Although limited, research has identified a range of factors that influence vicarious traumatisation, such as experience, personal trauma history and coping style. Future investigation is required to examine aspects that could enhance counsellor resilience. In addition, vicarious traumatisation needs to be studied in terms of a broad range of clientele and occupations.