This volume represents the proceedings of the Third International Conference on Situation Theory and its Applications, held at Oiso, Japan, in November of 1991. The Program Committee of the Conference consisted of the editors of this volume. Many people helped make the conference and this volume a success, too many to name here. Three deserve special mention, however: Shuji Doshita, Hideyuki Nakashima, and Syun Tutiya, who constituted the organizing committee.
The conference was supported by contributions from the Center for the Study of Language and Information at Stanford University and the New Models of Software Architecture Project of the Japanese Ministry of International Trade and Industry.
This contents of this volume do not coincide exactly with the presentations at the meeting; in particular, some papers given at the conference do not appear here for one reason or another.
This volume is organized along the same lines as its two predecessors, Situation Theory and its Applications, Volumes 1 and 2. We hope that this volume is a worthy successor to those predecessors and that readers of the volume will both profit from it and be inspired to contribute to the further development of the subject.