(10)To ensure that competent authorities take, at any time, appropriate supervisory measures with regard to extensions and changes to the alternative internal models and changes to the institution’s choice of the subset of the modellable risk factors, they should consider a group of related extensions or changes to an alternative internal model notified separately by an institution as a single extension or change. In such a case, competent authorities should assess whether extensions and changes to the use of the alternative internal models are material at the level of that single extension or change.