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This picture illustrates state models of the change requests of three different types:

1. Standard Change;
2. Normal Change;
3. Emergency Change.

Also, you can find a brief description of every status state under the picture.

Statuses Description

Registered

When the change request is newly created, it has this statusThe state for the newly created change requests. If this is a Standard change, then it transitions straight to the In Progress status, as the standard change Standard is a pre-approved type. If this is a Normal or Emergency change request, then the request transitions to the Authorization state.

Authorization

This status state is necessary to pass for Normal or Emergency Changes. In this statusstate, the request must be reviewed and authorized by the responsible persons or groups (see more on the Change Request Authorization). After all authorization steps have been passed, the change request transitions to the Scheduled status.

Scheduled

In this statusstate, the change request has the following prerequisites:

1. Planned start date;
2. Planned end date.

So it is preliminary known when it the change will be implemented.

In Progress

This status state displays that the request is in progress of implementation now. When the work is over, the status state has to be changed to the Completed.

Completed

After the work is over and the request is transited into this statusstate, the requester can perform the tests and give feedback by the results of the implementing. After this, move the request to the Closed status state. 

Post-Implementation Review

When the request is completed (whether successfully or not), the Change Advisory Board has a right to perform Post-Implementation Review on the basis of the implementing. It is a good practice that allows gaining the "lessons learned" after the implementation, especially if there were any issues on the way.

For this, the change request must be moved to this status state from the Completed status. After the review, similarly to the Completed status, mark it as Closed.

Closed

All activities on this change request are over, and it cannot be reopened.