This volume contains the papers that have been presented at the
Conference on Modeling and Control of Uncertain Systems held in Sopron,
Hungary on September 3-7, 1990, organised within the framework of the
activities of the System and Decision Sciences Program of IIASA - the
International Institute for Applied Systems Analysis. The importance of
the subject has drawn the attention of researchers all over the world
since several years. In fact, in most actual applications the knowledge
about the system under investigation presents aspects of uncertainty due
to measurement errors or poor understanding of the rele- vant underlying
mechanisms. For this reason models that take into account these
intrinsic uncertainties have been used and techniques for the analysis
of their behavior as well as for their estimation and control have been
devel- oped. The main ways to deal with uncertainty consist in its
description by stochastic processes or in terms of set-valued dynamics
and this volume col- lects relevant contributions in both directions.
However, in order to avoid undesirable distinctions between these
approaches, but on the contrary to stress the unity of ideas, we decided
to organize the papers according to the alphabetical order of their
authors. We should like to take this opportunity to thank IIASA for
supporting the Conference and the Hungarian National Member Organization
for the kind hospitality in Sopron. Finally we would like to express our
gratitude to Ms. Donna Huchthausen for her valuable secretarial
assistance. Vienna, February 20, 1991 GIOVANNI B.