主题：问个关于95/5原则的问题 -- 冰与火

The old "80/20" rule for software - that 80 percent of users use only 20 percent of a program's features - doesn't apply to Microsoft Excel. Instead, this program operates under what could be called the "95/5" rule: 95 percent of Excel users use a mere 5 percent of the program's features.

从 Formulas and Functions with Microsoft Excel 2003的介绍里找到的。