sentences:  Dr. Bracho in the late 1980s requested the collaboration of the National Polytechnic Institute and with the help of Eliseo Steve Rodríguez Rodríguez, then a student of the Instituto Tecnológico Autónomo de México developed the first prototype.The collaboration resulted in the creation of a system called SARCRAD (initials of "Sistema de Administración de Recursos Conceptuales y de Referenciación Automática Difusa" or System of Administration of Conceptual Resources and Diffused Automatic Referenciation) by Rodríguez.Enciclomedia is based on SARCRAD, a system that complements lessons from the free textbooks provided by the federal government with videos, text, virtual visits, sounds and images.