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 .