Closing the gap between research and clinical practice is nowadays considered a priority in outcome studies. Survey studies in community settings having as their main aim the multidimensional measure of outcome of mental health care interventions, including the use of standardised instruments administered as part of the routine clinical activities in mental health services, have recently started to be planned in various countries, but have encountered several difficulties. A naturalistic, longitudinal study aimed to assess the outcome of care provided by a community-based mental health service, the South Verona Outcome Project, has been conducted in Italy starting from the beginning of the 90's and is running since then. This paper: a) describes a series of methodological aspects of the South Verona Outcome Project, such as instruments, study design, inclusion and exclusion criteria, training of the staff, and focuses on strategies used so to ensure feasibility of the assessment and good quality of the data; b) summarises some results of the study, characteristics of feed-back provided, and outputs; c) discusses the problems faced, the impact of this approach on service provision, its limitations and future perspectives.