Language Support for Changeable Large Real Time Systems

A set of concepts for modeling large real time systems is discussed informally. The concepts upport he design of cenmtlized as well as distributed systems. They are object oriented in that they correspond to entities of the 'real world', and they are 'change oriented ' in that they support not only the first development s age of a system but also its continuous change and evolution. In particularly, the concepts give a promising solution to 'on the fly ' changes of exislzng, active entities. I