Like with many concepts in psychology, it's difficult to declare a single, clear cut definition for intelligence. In Chapter 9, one of things we'll discuss is the various types of intelligence.
The widely used terms "book-smart" and "street-smart" aren't enough to describe the
types of intelligence that psychologists have termed over the years. Do you know anyone who gives stellar speeches? They probably have a high level of linguistic intelligence. That person whose dance videos have over a million hits and thousands of thumbs-up on YouTube? They are said to have bodily-kinesthetic intelligence.
IQ tests were and continue to be controversial tools in psychology. Intelligence is a difficult concept to measure, especially given the many types that exist. This is why there are so many IQ tests but only a few that yield valid results, or at least as valid as we can get. But even those few tests don't tell the whole story about a person's mental capacity. As Howard Gardner, an American developmental psychologist, said in this article about a child's intelligence and learning development, "It is not how smart you are, it is how you are smart."