The ICTAC series, founded by the United Nations University's International Institute of Software Technology (UNU-IIST), brings together practitioners and researchers from academia, industry and government to present research and to exchange ideas and experience addressing challenges in both theoretical aspects of computing and in the exploitation of theory through methods and tools for system development. A further aim is to promote cooperation in research and education between participants and institutions from developing and industrial countries, as in the United Nations University's mandate. The previous four ICTAC events were held in Guiyang, China (2004), Hanoi, Vietnam (2005), Tunis, Tunisia (2006) and Macau (2007).