DCS State Transition Diagram

Start Item request Idle, No Request

Invoke to Read, Add, Remove, Update, and Query Items

Item Requests

Perform read-op-input

Alternate items/ category selected

Item Request done

Perform read-operation-input Perform read-op-input

	Diagnose Program Error

No item found for deletion, No item found for

Query, No item found to read, No category selected

Select alternate item, Select alternate category

Program Error

Call problem diagnosis

No Error found

Perform read-op-input

Notation:

Rectangles: System states

Arrows: labeled with a rule expression

Top value rule expression: Event that causes a transition

Lower value expression: Action that is caused as a consequence of the event