The background to IDA 2010, the 9th International Symposium on Intelligent DataAnalysis(IDA), is ratherunusual. Previously, thesymposiawereheldbi- nially at European venues. Over this time, the IDA Symposium had established an identity, a dedicated group of Program Committee members, and a regular audience. However, this success had come at a cost to the original ambitions for the symposium concerned with interfacing AI, statistics and computer science for important and di?cult real-world data analysis problems being comp- mised in favor of more standard data mining content. IDA 2010 was...