This is the focus of the SysML language, a language to model all of these different
factors in the course of engineering complex systems and systems of systems. The
purpose is not to mask the complexity of those systems, but rather to expose and
control it in the face of constantly changing business requirements and constantly
changing infrastructure.
SysML is likely not the last language for engineering complex systems; the fastpaced
change in most engineering fields (and in fact introduction of completely
new engineering fields, like bioengineering) will likely cause change in the specification
language itself. This shouldn ??™ t be a surprise to any engineer; other long-lasting
xispecification languages have changed over time. One simple example: building
blueprints are several hundred years old, but those made before about 1880 didn ??™ t
feature the international symbol for electrical outlets, since that feature didn ??™ t
exist yet. Languages change to suit changing requirements in engineering, and
xi Foreword
fortunately SysML itself is designed to change, by being based on a metamodeling
infrastructure also standardized by the OMG, the Meta Object Facility (MOF).
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