After reviewing several q&a regarding this topic i came with this detailed workflow.

I would like to check with you if it's correct and detailed.

1.- Receive FORMAL request of change from stakeholder. (Some questions tell you that the request is informal, so you have to make the customer to send a formal request).

2.- EVALUATE the impact, regarding scope, time, cost, quality, risk, Resources... (anything else here?).

3.- INFORM the stakeholder regarding the impact of the change.

4.- Send the request to CHANGE COMITE BOARD and/or SPONSOR