3.8. Interaction Diagrams
In UML “interaction diagram” is a generic term for sequence diagram, communication diagram, timing diagram, and interaction overview diagram. Since SysML uses only the sequence diagram the other diagram types will not be discussed in detail in this book.
Sequence diagrams are based on the interaction model that describes the interaction between elements of the system. It answers the question: “When does who call whom and how?” In contrast, the activity model answers the question: “What happens in which sequence?”, and the state model: “How does an object respond to events in a specific state?”
The other UML interaction diagrams that are not used by SysML are views on the same interaction model. This means that you don’t ...