1950s--1990s

audio-visual teaching theory

Audiovisual Communication Theory

Theoretical level: audiovisual communication

Instructional Design: Systems approaches are used for instructional design in educational technology

New technology practice

1990s-present

From the 1970s to the 1980s, microcomputers and multimedia technologies came into being.

In the 1990s, Internet of Things technology developed rapidly, and online learning and digital learning emerged

1930s--1950s

Radio broadcasting, talkies, tape recorders; film training techniques

In the 1950s, the advent of television; the Skinner Program Teaching Machine

Dell's "Tower of Experience Theory", "Audiovisual Teaching Method"

Visual and auditory studies

Started during the Renaissance movement from the 14th to 16th centuries - intuitive teaching

Before the 1930s

Visual aids, photographs, slides, silent films

1928, "Visual Education in Schools Publication"

In 1923, the Department of Visual Instruction (DVI) was established in the United States. AECT predecessor.