This volume contains the papers presented at the third International Conference on Object Oriented Information systems - OOIS '96, which was held at the South Bank University, London 16 - 18 December 1996. The papers published in this volume highlight the contributions of leading researchers in the field who are working with Object-Oriented technology, theory and practice. Among the topics covered are: Object Modelling; Programming Languages; Distributed systems; Inter-operability & Modelling; Methodologies; Object Databases; Software development; Tools and Techniques for Web Development.