The philosophical workshop "Causal Worlds" on aspects of semantics and pragmatics in David Lewis, Peter Menzies, and Judea Pearl took place on 27 Jan 2011 as an Open Session in the Forum Logik Series under the "Patenschaft" of Hans Rott (Regensburg University). Roland Poellinger commented on Stefan Ruhland's talk about the question "Is Causality an Absolute Relation?". Find more info about the speakers and the talks here.