This document summarizes the history and evolution of educational technology from the 18th century to the present. It outlines some of the key developments including the adoption of chalkboards and slates in the late 19th century, the introduction of radio and educational television in the 1920s-1950s, the emergence of language labs and overhead projectors in the mid-20th century, the rise of personal computers in schools in the 1980s-1990s, growing internet access and use of laptops in the 1990s-2000s, and modern technologies like interactive whiteboards. The timeline shows how technology has increasingly been integrated into classroom instruction over the past centuries.

1. Educational Technology By Marina Torres and Noelia Oliveira

3. Educational Technology Time Line 1780 1920 Early public schools adopted the teacher/manager model with the teacher as the primary manger of instruction and assessment in a single classroom . In 1920 the Radio Division of the U.S. Department of Commerce began to license commercial and educational stations. Soon schools, colleges, departments of education, and commercial stations were providing radio programming to schools. 1890 The School slate and the chalkboard.

4. Educational Technology Time Line 1950 Language-lab headsets: Schools began to install cubicles arm s with language-lab headsets and audio tapes. Educational television: By the 1958´s there channels that included educational programming on the air. 1930 Used for the U.S military to train forces in World War I, The overhead projector eventually spread to school .

9. Technology in the classroom today