When folks ask me what I do for a professional career, I usually tell them, “I write books about computers.” For those who are computer literate, the discussion usually continues this way: Them: “What subjects have you written about?” Me: “Mostly about using Microsoft Excel.” Them: “Like using Excel to do what?” Me: “Analyze data. In fact, I’m currently working on a book that will cover analyzing data using the Excel what-if tools.