Considering how to mode the following object types. TODO show sample activities

1. Work Item (Task): A single unit of work which needs to be completed
   1. Name
   2. Description
   3. Due By
   4. Assigned To
   5. Status: No Started, In Progress, Completed
2. Defect (Bug): A record which maps an issue to the task which needs to be completed. Derives from work item and has additional properties like
   1. Priority
3. Issue (Ticket): The problem which needs addressed.
   1. Description
   2. Severity
   3. Attachments
   4. Areas Affected
4. Milestone a collection of completed work items
5. Project a collection of tasks. Additional properties would be
   1. Name
   2. Description
   3. Priority
   4. Resources

Reference: http://en.wikipedia.org/wiki/Team_Foundation_Server