TOPIC: A question regarding approved change requests

The approved change requests are included as an input for control quality , basically, this's in order to verify the actions we took, whether corrective or preventive, are properly implemented.
However, it's stated that these approved change requests are coming from "perform integrated change control" process which i don't understand !
If the verification is about the work we perform in order to achieve the change request ; so this should be an output of "direct and manage work"process not" perform integrated change control"
So what's the reason behind this?

The critical part here is "approved". The output is not the change request, it is basically the approval of the change request and that is an outcome of the change control process

based upon PMBOK guide description for "approved change request review" tool, All approved changes should be reviewed to verify that they were implemented as approved ( page 252)
Moreover, at page 251, Approved change requests should be reviewed as the timely implementation of them should be verified.
As all these data and information should be gathered during direct and manage work as a part of work performance data and as most of the activities to implement such changes is also a part of this process, shouldn't this input to come from this process not from perform integrated change control ?