It's In the Numbers: Using Metrics to Plan Documentation Projects
http://www.writingassist.com/articles/plan-documentation-projects.htm

Yundt, Margie and Sherry McMenemy
Writing Assistance
2006

Abstract:

It's in the numbers. Creating documentation is not an exact science, yet as communication leaders, we are expected to provide real estimates for how much time we need to document a project, or what we can produce given a predetermined timeline.