In many scientific fields an increasing attention is being devoted to problems connected with
complexity, as testified, for example, by the recent book by Nicolis and Prigogine [1] …

The problem of controllability is a mathematical description of the general following situation.
We are given an evolution system (typically a physical one), on which we can exert a certain …

The notion of system complexity is much like St. Augustine's description of time:" What then
is time [complexity]? If no one asks me, I know; if I wish to explain it to one that asks, I know …

I would like in this presentation to explain why the study of complexity has become so
interesting today. The idea of studying complex systems is, of course, by no means new …

In science and technology, the history of a subject is usually considered as a separate study.
The present state of say chemistry, or linear system theory, can be defined without reference …

From an engineering perspective, it is well known that there are numerous problems to
predict and control complex systems. In addition, there are also problems to understand the …

There is an enormous literature on the complexity of systems, and with attempts at specifying
intrinsic measures of complexity. In this note, we will take an opposite view; that complexity …

The importance of control has led to the development of one of the modern world's key
technologies, and one whose use will increase rather than diminish. As such it needs a …

Science, and its attendant technologies, are in the midst of a serious crisis. The diagnostic of
this crisis is our inability to control the trajectories of organisms or social structures as we can …

From an engineering perspective, it is well known that numerous problems hamper the
control and prediction of complex systems that are essential for the reproducibility of their …