To understand how XML changes technical communication, we need to step back and look at how the rise of information technology has changed the content development process. Through the 1970s, most technical communication work had separate writing, layout, and production phases. Authors wrote content, typically in longhand or on typewriters. Typesetters would then rekey the information to transfer it into the publishing system. The dedicated typesetting system would produce camera-ready copy, which was then mechanically reproduced on a printing press.
In a desktop publishing environment, authors could type information directly into a page layout program and set up the document design. This eliminated the inefficient process of re-entering information, and it often shifted the responsibility for document design to technical communicators.

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