Chapter 4 Building Use Case Diagrams
The Specification tab contains the following properties, available via sub-tabs at the bottom of the dialog box:
| Property | Description |
|---|---|
| Action Steps | Provides a textual description of the normal sequence of actions associated with a use case.
For example, the action steps for a use case called 'register patient' in a hospital might be as follows: "Open a file, give a new registration number, write down medical treatment". |
| Extension Points | Provides a textual description of actions that extend the normal sequence of actions. Extensions are usually introduced with an "if ....then" statement.
For example, an extension to the action steps above might be: "If the patient already has a registration number, then retrieve his personal file". |
| Exceptions | Specifies signals raised in response to errors during system execution. |
| Pre-Conditions | Specifies constraints that must be true for an operation to be invoked. |
| Post-Conditions | Specifies constraints that must be true for an operation to exit correctly. |
Each of these sub-tabs contains a text box (RTF or TXT format) which lets you give a more detailed definition of a use case.
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