those who have gathered to celebrate his work in this volume will also be widely known for their own writings on this matter of critical methodology. Their signposts (or are they warning lights?) will be familiar to thoughtful philosophers and scientists, and they appear as queries as we read these papers: the rational heuristic and the irrational heuristic? accepting the fallible? differing societies but one rational cognitive practice? accepting evidence which is placebogenic? choosing among the incommensurables? what remains of the logic of demarcation? purpose in nature? progress of science? rationality in politics? a humane reasonableness and a critical rationalism? Gunnar Andersson sets the focus well for the reader. We need not choose between dogmatism and relativism, he argues. And then he tells the political lesson: we might avoid both anarchy and despotism.