This volume contains the papers presented at the 7th International Conference on Object Oriented Information Systems - OOIS 2001. The conference was hosted by the University of Calgary, Calgary, Canada on 27 - 29 August 2001. The theme of OOIS1 was Object-Oriented and Web-Based Frameworks for Information Systems. The papers published in this volume highlight the contributions of leading researchers and practitioners in the field of Object Technology and Information Systems. The topics covered include: OO foundations, OO modeling and analysis, OOIS processes, XML-based IS, OO-based reuse, OO frameworks, OO and web testing, Use case for requirement analysis, OO CASE tools, OO virtual environments and real-time systems, IT process assessment and improvement, Industrial experience and case studies, Web-based IS, Component-based OOIS, Software engineering metrics and analysis, Production line and requirements engineering, GRIDs: the next generation technologies for the Internet, E-Business Enterprise Frameworks, and Perspectives on future development.