(7)To enable competent authorities to assess compliance with the requirements for the validation and review of alternative internal models, institutions should perform the internal validation of the model at least annually. While initial validation should cover all methodologies applied throughout the internal model, it is appropriate to lay down, in consideration of staff and resources constraints, that the annual validation focuses on at least the main issues detected either in previous internal validations or previous internal audit reviews, and on any changes or new methodologies introduced in the alternative internal model.