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The use of media for instructional purposes is generally traced back to the first decade of the 20th century with the introduction of educational films (1900s) and Sidney Pressey's mechanical teaching machines (1920s).

The first all multiple choice, large-scale assessment was the Army Alpha, used to assess the intelligence and more specifically the aptitudes of World War I military recruits.

The Association for Educational Communications and Technology (AECT) denoted instructional technology as "the theory and practice of design, development, utilization, management, and evaluation of processes and resources for learning".

Initially, "virtual learning" as narrowly defined in a semantic sense implied entering an environmental simulation within a virtual world, for example in treating posttraumatic stress disorder (PTSD).

In practice, a "virtual education course" refers to any instructional course in which all, or at least a significant portion, is delivered by the Internet.

Educational technology is the use of both physical hardware and educational theoretics.

It encompasses several domains, including learning theory, computer-based training, online learning, and, where mobile technologies are used, m-learning.

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Accordingly, there are several discrete aspects to describing the intellectual and technical development of educational technology: An educational technologist is someone who is trained in the field of educational technology.