Andy Crowe in his PMP material, discussing Scope Verification, does an excellent job of discussing the difference between Requested Changes and Recommeneded Corrective Action. The key concept being that recommended corrective actions deals with effecting future results. The important question being how do we improve the plan in order to make sure the results will be more aligned to the planned values.
This is very similar to Plan Do Check Act (PDCA) cycle of Deming. Requested changes do not move the activity in the PDCA cycle, that is to say the changes are cimply carried out according to plan while recommened corrective action is an input to the plan and hence moves the data through the PDCA cycle.
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