Certification in Medical Education; Strategy for Educational Formation. Origins and Follow-Up. This study is a review of the problem of educational formation in terms of an international context, and determinant factors of this need are analyzed, barriers or limitations that have prevented such a formation are highlighted, and some development proposals for educational training are offered. It is also a description of the actions that the Facultad de Medicina (Medical School) of the Universidad Nacional Autónoma de México (National Autonomous University of Mexico) implemented from 1965 to 1996 to promote educational training. In 1997, the Diplomado en Enseñanza de la Medicina began as a new possibility for educational training. The first certification course ran in 1997, and there have been 18 courses to date, eight the Medical School and 10 at external institutions. In 1999, a follow-up questionnaire was answered by physicians trained under the certification program. Results showed that training received in the certification course had a positive effect on teaching skills of physicians who attended it, thus establishing the program as a good option for medical teachers.