The main elements of the chart - participant (actor) and precedent (option).
Party is a set of logically related roles with interaction with precedent or entity (system, subsystem, or class). A participant may be human or another system, subsystem, or class that represent something outside of nature. Graphically, the party represented “the man”.
Precedent (use case) - a description of a set of successive events (including alternatives) performed by the system, which lead to the observed participant results. Precedent represents the behavior of an entity, describing the interaction between the participants and the system. Precedent does not indicate “how” achieved some results, but only “what” it is done. Precedents are identified in a very simple way - in the form of an ellipse, inside which stated his name.
the Basic elements of entity relationship diagram
On the chart use you can display the following elements of UML notation that are available in the Toolbox:
|Option (Use case)|
|non-Directional Association (Undirected communication association)|
|Directed Association (Directed communication association)|
|curvature relationships (Point)|
|Connector (Note the connector)|