The objective of this study is to examine the relative contribution of three main factors (characteristics of services and service providers, characteristics of patients and caregivers, and impact of psychiatric illness) to caregiver satisfaction with services. Results of this study are based on the responses of 154 family caregivers of individuals with mental illnesses in Quebec, and indicate that these aspects play a predictive role in caregiver satisfaction with services. A multiple regression model explained 42% of the variance in satisfaction. Collaboration with professionals is the key determinant in the model, as it contributes more than any other variable to satisfaction. Results demonstrate the importance of obtaining a better understanding of caregivers' satisfaction with services in order to increase their involvement in community integration.