Following successful workshops held in Cyprus (2005), France (2006), Portugal (2007), and Mexico (2008), this was the fifth in a series of fact-oriented modeling workshops run in conjunction with the OTM conferences. Fact-oriented modeling is a conceptual approach to modeling and querying the semantics of business domains in terms of the underlying facts of interest, where all facts and rules may be verbalized in language readily understandable by users working in those business domains.