The document discusses several theories of intelligence, including Spearman's two-factor theory proposing general and specific abilities, Thurstone's rejection of a general factor in favor of seven specific abilities, Gardner's addition of naturalistic intelligence, and Sternberg's triarchic theory of analytical, creative, and practical thinking skills. It also covers emotional intelligence and its four aspects, common IQ tests including the Stanford-Binet and Wechsler scales, the meaning and uses of IQ scores, and the ongoing debate around the influence of nature vs nurture on intelligence.

1. Chapter 31