\After a short introduction, we will read and critically discuss classical papers on the concept of complexity, e.g. from Warren Weaver (1948), Herbert A. Simon (1962), Donald T. Campbell (1974) and William C. Wimsatt (1974). We will then read and critically discuss contemporary authors who address different aspects or specific concepts of complexity, e.g. James Ladyman et al (2012), Hans-Jörg Rheinberger (1997), Helen Longino (2008).