Museums went through many changes before the principle of free public access was established. At first restricted to very special publics, access was lated allowed to scholars, then to artists, and finally to the general public; the educational services of the museums developed simultaneously. Museums have the problem of meshing these new educational activities with the traditional scholarly activities. They are already caught up in the movement of adult education. Since this is very different from education for the young, the museum director should separate and approach differently his work with adults and with youngsters. Labels must be made easily understandable; circulation of adults can be arranged according to the principle of progressive self-selection. A museum should see that guides are knowledgeable but allow them to have a variety of styles of presentation. It may advertise its exhibits through the mass media, through work with organizations, or through direct mail. There should be some effort to evaluate the educational impacy of a museum event. (Appendixes include a description of educational activities of the Polytechnical Museum in Moscow and of adult education in museums in Mexico.) (NL)