Today we’re pretty sure that is wrong. Thanks to Howard Gardner’s groundbreaking work and to corresponding developments in neurobiology, most experts now suspect there are at least several different kinds of intelligence. Rather than a single quantity, intelligence is now largely seen as a grouping of capacities, each defined by Gardner as “an ability to solve a problem or fashion a product that is valued in one or more cultural settings.”
How many are there? At last count, Gardner list 8 1/2 … Linguistic, Logical-Mathematical, Visual-Spatial, Musical, Bodily-Kinesthetic, Interpersonal, Intrapersonal, Naturalist and half for Comedic Intelligence.
How many are likely to emerge? Nobody really knows, but ultimately the question of precise numbers misses the point: a more important question may be, “How do we use our many skills most effectively?” And the answer seems to be. “Use them often.”