Overview: The International Colloquium on Theoretical Aspects of Computing (ICTAC) held in 2006 in Tunis, Tunisia, was the third of a series of events created by the InternationalInstituteforSoftwareTechnologyoftheUnitedNationsUniversity. The aim of the colloquium is to bring together researchers from academia, - dustry, and governmentto present their results, and exchange experience, ideas, and solutions for their problems in theoretical aspects of computing. The previous events were held in Guiyang, China (2004), and Hanoi, Vi- nam (2005). Beyond its scholarly goals, another main purpose of
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