This study examined the effectiveness of a systemic cybernetic counselling approach with 3 females with bulimia nervosa. Bulimia nervosa is a relatively recent diagnosed condition (1980). Thus, little is known about the efficacy of different treatment approaches. The systemic cybernetic counselling approach (White; de Shazer) which informs family therapy represents a potentially powerful form of treatment in that it allows a complex construction of the problem. The research design employed a multiple (3) single case study approach with embedded units of analyses. The 3 women, aged 17 to 27, were seen over a 2-3 month period for 4-8 one hour sessions. Predicted patterns of non-equivalent dependent variables were compared with empirically based patterns over time. Continuous (including pre-, post-treatment and long-term follow up) assessment of frequency of bingeing/purging was established as well as ratings on other dependent variables - psychometric measures (Eating Disorders Inventory, Beck Depression Inventory, Coopersmith Self Esteem Inventory), affective self reports and reports by others. Results show that all three clients eliminated bingeing/purging by post-treatment. Two clients maintained this improvement on all dependent measures at long-term follow up. The most marked improvements were associated with the least severe pre-treatment scores. In the case where the whole family attended counselling sessions, the number of sessions was reduced. On the basis of the results, systemic cybernetic counselling procedures hold promise for the successful treatment of bulimia nervosa.