Polished Panache: The Empowered Corporate Style Guide 
A customized style guide is a document that defines the specific formatting, mechanical, punctuation, and spelling standards for your department or company. When you decide that you need a customized style guide, many questions arise: Where do you start? How do you get there? Exactly where is it you want to go? Are there more issues you need to define? Deciding that you need a customized style guide is the first hurdle. Persuading upper-level management to fund the guide is the second hurdle. And then it’s off to the races...
Corbett, Lori. STC Proceedings (1996). Articles>Style Guides