(37)National supervisors have important and long-established expertise in the supervision of credit institutions within their territory and their economic, organisational and cultural specificities. They have established a large body of dedicated and highly qualified staff for those purposes. Therefore, in order to ensure high-quality, Union-wide supervision, national competent authorities should be responsible for assisting the ECB in the preparation and implementation of any acts relating to the exercise of the ECB supervisory tasks. This should include, in particular, the ongoing day-to-day assessment of a credit institution’s situation and related on-site verifications.