Developing the Specification for a Document
http://www.tech-writer.net/planningadocument.html

Tech-Writer

Abstract:

Between 25-30 percent of the overall writing time is typically devoted to developing the document specification, meaning how the document will be formatted and actually present the information. This is true even when the organization has a style guide with a prescribed format, but no “standard” for documentation overall. Although this may seem an inordinate amount of time and effort on the front end, before getting any information onto the paper, it is far more cost-effective than spending unplanned time rewriting and reformatting the document late in the production process.