The conference on Object Oriented Information Systems (OOIS) is now an es- blished international conference where innovative ideas, research, applications, and experiences in the design, development, and use of object oriented infor- tionsystems,fromboththeacademicandindustrialenvironments,arepresented. The ninth OOIS conference was held at the University of Geneva, September 2–5, 2003. The main theme was the Evolution of Object Oriented Information Systems. The papers presented ideas and issues related to the evolution, ad- tability, restructuring, and ?exibility of OOIS. In the context of the conference, ?ve workshops and four tutorials were organized providing a discussion forum for new ideas and including in depth presentations on important “hot” subjects. The three invited speakers of the ninth OOIS conference provided an - ternative view on OOIS and their evolution. Prof. John Mylopoulos (Univ- sity of Toronto and VLDB president) gave the opening presentation entitled “Agent Oriented IS Development” , Dr. Richard Soley (OMG President and CEO) gave the closing presentation entitled “Model Driven Architecture: The Evolution of Object-Oriented Systems?” and Prof. Lina Al-Jadir (American U- versity of Beirut) gave the theme presentation entitled “Once Upon a Time a DTD Evolved into Another DTD...”.