(3)To increase the efficiency and effectiveness of the functioning of colleges of supervisors, the written arrangements referred to in Article 48(6), third subparagraph, of Directive (EU) 2019/2034 should cover all areas of college work. Those written arrangements should therefore also cover arrangements among college members involved in specific college activities, including activities performed through specific substructures of the college where such substructures are established for efficiency purposes. For the same reason, the written arrangements should also cover the operational aspects of college work, as those aspects are essential for facilitating the functioning of the college of supervisors both in going concern and during emergency situations. Finally, the written arrangements should be comprehensive, consistent and exhaustive and should provide an adequate and appropriate basis for the competent authorities to discharge their duties and tasks within, rather than outside, the college of supervisors.