<p><strong>'Probably the only book published this year which will outlive this century.'</strong> - <em>Arthur Koestler</em><br /><br /><strong>'It is good to have this brilliant book at last available in English.'</strong> - <em>The Times</em><br /><br /><strong>'This is one of the three or four most important books of the methodology of the social sciences to appear since the war.'</strong> - <em>New Statesman</em><br /><br /><strong>'Popper's work is of far greater than mere academic value; it has an immediate and manifest bearing on the political decisions that everyone has to make.'</strong> - <em>The Listener</em><br /><br /><strong>'Should be read even by those who will not agree with it.'</strong> - <em>Tribune</em></p><p><strong>'This is the theoretical companion to the better-known <em>Open Society and Its Enemies</em>. It puts paid to all attempts at futurology by pointing out that the future depends on new knowledge which by definition we do not have today.'</strong> - <em>Samuel Brittan, The Week, 2nd April 2005</em></p>