Lumsdine (1964) has given three approaches to educational technology. These are explained below.

Educational Technology 1 Or Hardware Approach.

It is the old meaning attached to educational technology. It is the use of the existing technology to the field of the education. Technology is not specially developed only for the field of education , eg. Radio, Television , Tape recorder, Video cassette, Recorder (VCR),  Computers,  Films etc.

Silverman (1968) called this technology as “Relative technology”. This is also called “Borrowed Technology”. It is borrowed from other fiels and is used in the field of education. This technology is called “Technology in Education”

Origin Of this technology was in physical sciences and engineering sciences. It is based on the application of engineering principles of developing electronics and electro-mechanical equipments. This educational technology has mechanized the whole teaching-learning process as technology has influenced other fields relater with man .

Audio-Visual aids such as maps, charts, models, films, films-strips have revolutionised the teaching-learning process. Use of the technology makes teaching effective and interesting . Students get more interest in teaching, they are motivated to learn with the help of these aids-hence learning is emphasised ,made interesting and permanent.

The type of educational technology is used in preservation of knowledge, transmission of knowledge and enrichment of knowledge. The teacher can reach a large number of students using this type of educational technology, he can reach even remote areas. This type of educational technology iss very effective knowledge explosion.