Ruler of All You Survey: How to Make the Best Use of Word's Rulers
http://word.mvps.org/FAQs/Formatting/UsingRulers.htm

Barnhill, Suzanne and Dave Rado
Word MVP Site, The
2005

Abstract:

If you work for a company of any size at all, then simply getting your staff to use the ruler properly will save them many hours every week, and significantly increase your company's profitability.