The document discusses the history of telesecundarias in Mexico from 1964 to the early 21st century in 4 periods: 1964-1970, 1970-1978, the 1990s which focused on equipping classrooms, and the early 21st century with the beginnings of Enclomedia.

1. TELESECUNDARIAS 1964

2. 1970-1978

3. DECADA DE LOS 90,EQUIPAMIENTO DE
AULAS

4. ENCLOMEDIA, ALBORES SIGLO XXI