13.1. Contracts
Use cases are the primary mechanism in the UP to describe system behavior, and are usually sufficient. However, sometimes a more detailed description of system behavior has value. Contracts describe detailed system behavior in terms of state changes to objects in the Domain Model, after a system operation has executed.
System Operations and the System Interface
Contracts may be defined for system operations—operations that the system as a black box offers in its public interface to handle incoming system events. System operations can be identified by discovering these system events, as shown in Figure 13.1.
Figure 13.1. System operations handle input system events.
The entire set of system operations, across all use cases, defines ...
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