By the Enlightenment Programme I mean the idea of the 18th century French Enlightenment of learning from scientific progress how to go about making social progress towards world enlightenment. Three steps need to be got right to put the basic Enlightenment idea into practice correctly: (i) The progress-achieving methods of science need to be correctly identified. (ii) These methods need to be correctly generalized so that they become fruitfully applicable to any worthwhile, problematic human endeavour, whatever the aims may be, and not just applicable to the endeavour of improving knowledge. (iii) The correctly generalized progress-achieving methods then need to be exploited correctly by the great human endeavour of trying to make social progress towards an enlightened, civilized world. Unfortunately, the philosophes of the Enlightenment got all three points disastrously wrong. They failed to capture correctly the progress-achieving methods of natural science (in that they defended inductivist, or at least verificationist, conceptions of science); they failed to generalize these methods properly; and, most disastrously of all, they failed to apply them properly so that humanity might learn how to become more civilized or enlightened by rational means. Instead of applying the generalized progress-achieving methods of science to social life itself, so that social progress might be achieved, the philosophes sought to apply scientific method merely to social science. Reason (as construed by the philosophes) got applied, not to the task of making social progress towards an enlightened world, but to the task of making intellectual progress towards greater knowledge about the social world. Social inquiry was developed, not as social methodology or social philosophy, but as social science. This traditional but botched version of the Enlightenment Programme was immensely influential. It was developed throughout the 19th century by Comte, Marx, Mill and many others, and was built into the institutional structure of academic inquiry in the 20th century with the creation of departments of social science: anthropology, economics, psychology, sociology, linguistics, political science...