Writing a book is a lot like writing a Visual Basic application. Well, except for the parts about finding a publisher and working with an editor. And then there’s that pesky rule about correct spelling. Come to think of it, they’re really quite different. But in one way, books and programs are similar: They are both written to meet the needs of the user. When writing software applications, the user’s needs drive the organization and features of the final program. When writing a book, like the one you’re looking at now, the needs of the user—that’s you, the reader—drive the organization and features of the final text.