During 1966 and 1967, 29 of the 39 hospitals conducting internships approved by the American Medical Association in New Jersey and representing more than 80% of the interns in the state joined in an internship evaluation by means of a preinternship and postinternship National Board Part III Examination. Through the cooperation of the hospitals' directors of medical education, there was almost 100% enrollment in the program by interns in participating hospitals. Improvement between the preinternship and postinternship examination was roughly the same for foreign as for American graduates, although foreign graduates obtained lower scores. Performance by American graduates was similar to performance of American graduates in other large groups. There was a large conversion from fail to pass among foreign graduates.