What is the difference between a correction, an interim control, a root cause, a CAPA, and a retrospective review?

These elements serve different purposes and should not be blended together. A correction addresses the specific observed condition; an interim control protects operations while the investigation continues; root-cause analysis explains why the issue occurred; CAPA changes the system to prevent recurrence; and retrospective review determines whether the same weakness affected prior records, batches, products, or decisions. A credible remediation plan links these elements in sequence and shows who owns each action, what evidence will demonstrate completion, and how the organization will determine whether the action was effective.