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. Wooldridge also shows how meritocracy has now become corrupted and argues that the recent stalling of social mobility is the result of failure to complete the meritocratic revolution. Rather than abandoning meritocracy, we should call for its renewal.