The theory that intelligence is a single general factor has much more support than the theories that state there are multiple levels of intelligence.

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The theory of a single general intelligence, often referred to as "g" theory, proposed by Charles Spearman, has been challenged and expanded upon by numerous psychologists and researchers. Theories such as Howard Gardner's Multiple Intelligences and Robert Sternberg's Triarchic Theory of Intelligence argue for the existence of multiple, distinct types of intelligence, reflecting a broader understanding of human cognitive abilities. These theories have garnered significant support and have influenced educational practices and psychological assessments, indicating that the notion of intelligence being multifaceted has considerable backing in the field of psychology.

The Theory That Intelligence Is a Single General Factor Has