This volume contains the proceedings of ICTAC 2004, the 1st International Colloquium on Theoretical Aspects of Computing, which was held in Guiyang, China on 20 24 September 2004. ICTAC was founded by the International Institute for Software Technology of the United Nations University (UNU-IIST). Its aim is to bring together pr- titioners and researchers from academia, industry, and government to present research results, and exchange experience, ideas, and solutions for their pr- lems in theoretical aspects of computing. The geographic focus of the ICTAC events is on developing countries to...

ThisvolumecontainstheproceedingsofFM2003, the12thInternationalFormal Methods Europe Symposium which was held in Pisa, Italy on September 8 14, 2003. Formal Methods Europe (FME, www. fmeurope. org) is an independent - sociation which aims to stimulate the use of and research on formal methods for system development. FME conferences began with a VDM Europe symposium in 1987. Since then, the meetings have grown and have been held about once - ery 18 months. Throughout the years the symposia have been notably successful in bringing together researchers, tool developers, vendors, and users, both...