In Greece, school archives are no more considered only as the fundamental documents of a school which are absolutely necessary in administration but they are appreciated also as valuable tools for the teachers in their efforts both to highlight the history of a particular school or the function of certain educational institutions and to construct the educational memory. Thus, the nature of our school archives, the evaluation of their documents and their use in teaching, especially in the secondary schools where the organization of the archives is more systematic within the scope of research projects, are some the points this paper is focused on.