This study describes scales which can be used to identify the levels of stress and reward associated with being a AIDS emotional-support volunteer. Four categories of stressors were identified. These were 'emotional overload', 'client problems', 'lack of support' and 'lack of training'. The reward categories were 'personal effectiveness', 'emotional support', 'social support' and 'empathy/self-knowing'. There were low, but positive correlations between these stressor scales and other measures of psychological morbidity, the 28-item General Health Questionnaire (GHQ) and the Maslach Burnout Inventory (MBI). Levels of stress and reward were positively correlated and, taken together, the scales may be of use as a measure of the degree of involvement of volunteers in the AIDS care-giving process. Although these scales were derived from items provided from AIDS emotional-support volunteers many of the items may also be relevant to other health workers providing care for people with AIDS.