The SysML Notation

This chapter looks at the two aspects of modelling that are necessary in SysML the structural and behavioural aspects of a system. Block definition diagrams are used to discuss structural diagrams, and behavioural modelling is discussed by considering how the various diagrams relate to system hierarchy and engineering activity. A key consideration when modelling is consistency, leading to a good correct, concise and consistent model, which leads directly to confidence in the system. Confidence means that the system is understood and can be communicated to other people. Remember: SysML + consistency = model SysML consistency = pictures. The nine SysML diagrams are briefly introduced, with the five diagrams that are used by ACRE covered in more detail. For each diagram, its notation is introduced along with examples of its usage. These examples are taken from the world of escapology, namely the so-called coffin stunt, which is chosen since it ties in with the example system used in the case study.