The article presents the experience of the Russian-British project "The assessment of the quality of educational activities of schools and the creation of programmes for their development." The key question for the research team was the following: what is the way to develop, verify and hand such a model of assessment to all interested users that would reflect the quality of the educational activities of schools in quite a representative way, would base on comparable criteria and would be quite easy to use? The work began with a two-year experiment, which involved the participation of 36 schools in Russia (Volgograd) and 9 schools in Great Britain (Brighton Hove). During the pilot experiment there were interviewed heads of educational institutions, employees of the administrative apparatus on the city and municipal levels, and scientiststhe teachers of teacher training university. All of them were asked what factors, in their opinion, affect the quality of education at school? Their views on the factors of quality of school education have served for the research team as one of the sources of evaluation criteria determining the quality of the educational activities of schools. As a result, a criterial model of the quality assessment of educational activities of schools was constructed.