Article 171 3.

Institutions shall use a time horizon longer than one year in assigning ratings. An obligor rating shall represent the institution’s assessment of the obligor’s ability and willingness to contractually perform despite adverse economic conditions or the occurrence of unexpected events. Rating systems shall be designed in such a way that idiosyncratic changes and, where they are material drivers of risk for the type of exposure, industry-specific changes are a driver of migrations from one grade or pool to another. Business cycle effects may also be a driver of migrations.