OBJECTIVES: To describe the process of the adaptation and standardization of the VSSS-54 (Verona Service Satisfaction Scale) in Greece. METHODS: The methodology followed was identical with this of the EPSILON study of schizophrenia. The Italian Version of the VSSS-54 was first translated into Greek, by two bilingual translators. The resulting translation was then back-translated into Italian by a professional translator. The back-translation was checked by the authors of the VSSS and compared with the original version. The content and the language of the final Greek translation were discussed in focus groups, carried out in the Department of Psychiatry of the University General Hospital of Ioannina. The analysis of results of the first group (patients-relatives) as well as the second group (professionals), allowed us to retrieve useful information related to the adaptation of the Italian questionnaire VSSS into the Greek language. The research was carried out in two outpatient psychiatric services in Athens and in Ioannina. A total of 150 patients were selected (87 women, 63 men), whose age ranged from 18 to 65 (M=43.7, SD=11.45). Among them 64(43%) had diagnosis of schizophrenia or other psychosis, 74(49%) affective disorder and 10 (6.6%) anxious disorders. The reliability analyses are based on classical test theory. Reliability measures used are Cronbach's a, Cohen' s weighted k, and the intra-class correlation coefficient. RESULTS: The a coefficient for the VSSS total score was 0.917 (95%Cl 0.878 –0.948). Test- retest reliability was proven to be good. CONCLUSIONS: The psychometric properties of the Greek version of the VSSS are similar to those of the Italian and the other European versions of the instrument,outcome which proves that it is a valid and reliable instrument to use in the Greek context.