Learning Objectives

10.1 Explain how psychometric theories, and alternative accounts, solve the problem of whether to classify intelligence as a single trait or as a series of separate abilities.
10.2 Identify the components of a good test and discuss the meaning, properties, and criticisms of the intelligence quotient (IQ).
10.3 Explain how environmental influences on intelligence can interact with genetic influences, and consider how IQ changes with age.
10.4 For each of the major sections of the chapter, summarize how the study of intelligence helps us to understand behavior and mind.