The agencies' analysis of and reaction to QIS4 results show how those safeguards work: We saw results that gave us concern, and so we are investigating further before we go to the next stage.
Additional, future safeguards - such as the NPR process and the minimum one-year parallel run and the minimum two-year transition period, with options to extend either - will also ensure ample opportunity to recalibrate or seek other adjustments if necessary.