Microsoft Excel is the world’s most widely used analytic tool, with estimates as high as 750 million users worldwide. When used for financial data, Excel works well as a personal productivity tool, allowing a single user to manipulate clean data and examine specific tactical questions such as “What were my revenues for our Western Region last year?” Excel quickly becomes problematic, however, as you add more users, data sources, formulas, and questions—all of which are critical to understanding and optimizing financial performance.