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...".