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==History==
Since its origins in the 1980s<ref>Benson, Tim. "The history of the Read codes: the inaugural James Read Memorial Lecture 2011." ''Informatics in primary care'' 19.3 (2011): 173-182. http://www.ingentaconnect.com/content/bcs/ipc/2011/00000019/00000003/art00008</ref>, the system has evolved through three major technical design changes and significantly expanded its content.
===READ version 1 (4-Byte READ)===
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* the relative position of one code to another was represented through the code itself: [J...] is the common ancestor of all other codes with 'J' as the first character, and [J1..] in turn the common ancestor of all codes beginning 'J1'.
Because of its four character code structure, READ Codes version 1 was more commonly known as 4-Byte READ. The first release was in April 1986; the final official release of 4-Byte READ occurred in April 2009.
===READ version 2 (5-Byte READ)===
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