Historians identify two types of positivism: classical positivism, an empirical tradition first described by Henri de Saint-Simon and Auguste Comte,[1] and logical positivism, which is most strongly associated with the Vienna Circle, which met near Vienna, Austria, in the 1920s and 1930s.[2] Postpositivism is the name D.C. Phillips[3] gave to a group of critiques and amendments which apply to both forms of positivism.[3]