| Interface | Description | 
|---|---|
| IWorkItemLifecycleEvent | 
 Encapsulates all information pertaining to a "work item" at a specific point in its lifecycle. 
 | 
| IWorkItemLifecycleEventPublisher | 
 Responsible for publishing  
IWorkItemLifecycleEvents. | 
| IWorkItemLifecycleEventSubscriber | 
 A common interface for components wishing to listen for  
IWorkItemLifecycleEvents. | 
| IWorkItemLifecyclePhase | 
 A common interface for work item lifecycle phases. 
 | 
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