This book constitutes the refereed proceedings of the 4th International Conference on Distributed Computing and Internet Technology, ICDCIT 2007, held in Bangalore, India, in December 2007. The 13 revised full papers and 20 revised short papers presented together with three invited papers were carefully reviewed and selected from 170 submissions. The papers cover the main areas of distributed computing, internet technology, system security, data mining, and software engineering.