Meritocracy: the idea that people should be advanced according to their talents rather than their status at birth. For much of history this was a revolutionary thought, but by the end of the twentieth century it had become the world's ruling ideology. How did this happen, and why is meritocracy now under attack from both right and left? Adrian Wooldridge traces the history of meritocracy forged by the politicians and officials who introduced the revolutionary principle of open competition, the psychologists who devised methods for measuring natural mental abilities and the educationalists who built ladders of educational opportunity. He looks outside western cultures and shows what transformative effects it has had everywhere it has been adopted, especially once women were brought into the meritocractic system.