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A helpful discussion of the different programming techniques was given by Klaus.<ref>Klaus D.J. 1965. An analysis of programming techniues. In Glaser R. (ed) 1965. ''Teaching machines and programmed learning II''. Washington D.C. Department of Audiovisual Instruction, National Education Association of the United States.</ref>
=== The two main systems of programed learning ===
Although there were three or four other systems proposed, we discuss here the two best-known methods.
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