Six Steps for Successful Document Downsizing 
By using the following method, the Mentor Graphics system management documentation and training group was able to achieve a 40% reduction in the size of the documentation needed to install and configure Mentor Graphics software. Not only did this reduction result in an approximate savings to the company of $50,000, but also produced a verifiable increase in customer satisfaction.
Tucker, Walt. STC Proceedings (1996). Articles>Documentation>Methods