This book constitutes the refereed proceedings of the Second International Conference on Electronic Commerce and Web Technologies, EC-Web 2001, held in Munich, Germany in September 2001. The 31 revised full papers presented together with one invited survey were carefully reviewed and selected from more than 80 submissions. The papers are organized in topical sections on Web software development; XML transformation; electronic payment, simulation and case studies; modeling design, and complex transactions; security aspects; electronic negotiation and trust; product catalogs; Web site engineering; user behaviour and modeling; and business models and system aspects.