This is the Second Edition of Nathan Brody's popular book Intelligence, originally published in 1976. It presents a comprehensive review of contemporary research in this field, including coverage of such controversial topics as the genetic and environmental influences on IQ and individual and group differences in intelligence. The book also discusses both the psychometric and cognitive approaches to intelligence as well as new theories in the field.Key Features* Discusses both the psychometric and cognitive approaches to intelligence* Provides a comprehensive review of contemporary research in this realm* Covers new theories of intelligence.