The authors have investigated a sample of 283 3th and 4th grade students in secondary schools of Zadar where they tested the reliability and factor structure of ROU-questionnairc scale measuring classroom psycho-social study atmosphere. On the basis the obtained reliability coefficients (type Cronbach- alfa) the authors established that all scales included in the questionnaire had a satisfactory reliability. Two factors were extracted from the factor analysis and they were: 1. factor of individualisation and personal development and 2. factor of satisfaction with relationship in the class which gave explanation to 52.17 % of common variance of all the results.
