(3)The assessment by competent authorities of an institution's compliance with the requirements referred to in points (a) and (b) of Article 312(4) of Regulation (EU) No 575/2013 to use Advanced Measurement Approaches should not be conducted in a uniform manner. The nature of the elements to be assessed varies according to the type of assessment conducted which in turn depends on the type of application submitted. Competent authorities are required to assess such compliance where an institution first applies to use AMA, where an institution applies to extend the AMA in accordance with the approved sequential implementation plan, where an institution applies to extend or change the AMA it has been granted permission to use, and where an institution applies to return to the use of less sophisticated approaches in accordance with Article 313 of Regulation (EU) No 575/2013. In addition, competent authorities should conduct an ongoing review of the use of the AMA by institutions. Accordingly, competent authorities should conduct the assessment of an institution's compliance with the requirements to use AMA in accordance with the nature of the elements to be assessed corresponding to the relevant assessment methodology.