This book constitutes the best papers of the First International Conference on Software and Data Technologies, ICSOFT 2006, held in Setúbal, Portugal, September 11-14, 2006.The 25 revised full papers presented together with 5 invited papers were carefully reviewed and selected from 187 submissions. The papers are organized in topical sections on programming languages, software engineering, distributed and parallel systems, information systems and data management, as well as knowledge engineering.