This book constitutes the refereed proceedings of the Third International Conference on Web-Age Information Management, WAIM 2002 held in Beijing, China in August 2002. The 40 papers presented together with two system demonstrations were carefully reviewed and selected from 169 submissions. The papers are organized in topical sections on XML; spatio-temporal databases; data mining and learning; XML and web; workflows and e-services; bio informatics, views, and OLAP; clustering and high-dimensional data; web search; optimization and updates; and transactions and multimedia.