6/9. Battle of the Brains. The most popular way in which human intelligence is measured is the 10 test, but is this the most effective? A growing number of psychologists argue that the assessment only tells half the story because no-one can quite agree on what intelligence is. After an examination of the most recent theories, this programme conducts an experiment on seven highly-qualified people from different occupations, including a fighter pilot, a Wall Street trader, a chess grandmaster and a quantum physicist. Each is put through a series of tests based on the latest research to determine who has the highest intelligence. But are the results conclusive? Director Dick Taylor ; Editor Andrew Cohen What's in a number?: page 59