This book constitutes the refereed proceedings of the Second International Workshop on Data Engineering Issues in E-Commerce and Services， DEECS 2006 held in San Francisco， California， USA in June 2006.The 15 revised full papers and 8 revised short papers presented were carefully reviewed and selected from 47 submissions. They address issues such as service engineering， service-oriented architecture， data and knowledge engineering， business models and analysis， system and tool implementation， and applications to service practices. The papers are organized in topical sections on e-commerce services， business processes and services， data and knowledge engineering， business models and analysis， Web services， and e-commerce systems.
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