By Ralph I. Stephens, Ali Fatemi, Robert R. Stephens, Henry O. Fuchs, Ali Faterni,
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Only minor errors and formatting changes were made to the Merge Team version in order to issue it as the Final Adopted Specification. 8. The main features of the Final Adopted Specification, with a comparison with UML, are summarized here. UML not required by SysML SysML does not include the following UML diagrams: • • • • • • object diagram deployment diagram component diagram communication diagram timing diagram interaction overview diagram. UML reused by SysML SysML reuses seven UML diagrams, some of which are renamed or have minor changes to their syntax.
The system boundary draws the line between what is inside and what is outside the system. Effectively, the system boundary defines the scope and context of the system. These new terms are very important, as they allow the concept of a ‘context’ to be introduced, which is a very useful tool when it comes to trying to understand the three basic types of system that were introduced in this section: systems of interest, enabling systems and systems of systems. 3 The ‘context’ In order to illustrate the idea of a context, it is first necessary to consider a simple example.
This would be realized in SysML using an interaction diagram, such as a sequence diagram. Life cycles and life-cycle models will be discussed in more detail in Chapter 6. 5 Projects Systems would not come into existence without projects. Projects are the things that deliver products and services and every project will have a life cycle. A project will deliver a number of products or services. In the case of a product, this is usually something tangible that many people will think of as a system.