It describes blocks the principle structural construct of SysML and the two types of diagrams used to represent structure the block definition diagram and the internal block diagram.
The first use, in this context, of the word graph is attributed to the 19th-century Englishman James Sylvester, one of several mathematicians interested in counting special types of diagrams representing molecules.
Diagrams are often used to model complex systems: in many cases several different types of diagrams are used to model different aspects of the system.
The method can predict also the different types of diagrams describing the dependence of a state variable of the reactor on a design or operating variable.
Abstract Voronoi diagrams [R. Klein, Concrete and Abstract Voronoi Diagrams, Lecture Notes in Computer Science, vol. 400, Springer-Verlag, 1987] were designed as a unifying concept that should include as many concrete types of diagrams as possible.
In a UML model, different aspects of a system are covered by different types of diagrams and this bears the risk that an overall system specification becomes barely tractable by the designer.
As already said in the previous paragraph, UML provides several types of diagrams which allow capturing of different aspects and views of the system.
A variety of different types of diagrams are used throughout the text to illuminate evolutionary principles, which are essential to ameliorate the effects of misconceptions.
Later in the paper (see Section 4), we shall augment these types of diagrams to include also the effect of rejuvenations.
