(5)Where risk factors are points of a curve, a surface or a cube, the modellability of those risk factors should be assessed following the modellability of each bucket of that curve, surface or cube, due to shared characteristics of risk factors belonging to a given bucket. The modellability of that bucket should thus be assessed by reference to all the verifiable prices that are allocated to that bucket, while the verifiable prices representative of one risk factor in a bucket should be considered as being representative of all risk factors belonging to the same bucket. In addition, institutions should be allowed to choose standard buckets, or, where deemed more appropriate for a specific curve, surface or cube, alternative buckets developed by themselves.