A well-developed vocabulary pays off in many important ways. Better-than-average “word power” makes it easier to understand everything you read and hear—from textbook assignments to TV news reports or instructions on how to repair a bicycle. And word power obviously increases your effectiveness as a communicator. Think about it: As far as other people are concerned, your ideas are only as convincing as the words you use to express them. In other words, the vocabulary you use when you speak or write always significantly adds or detracts from what you have to say.