The objective of this Work Area has been to undertake a detailed and itemised analysis based on population and sample analyses of the loan portfolios of the 14 banking groups included in the scope of the independent evaluation. This work has been undertaken by the four largest audit firms in Spain (Deloitte, PwC, Ernst & Young and KPMG). The 14 banking groups included in the exercise were assigned to each audit firm, and none of the audit firms reviewed banks audited by them in the last two financial years, in order to guarantee their independence. The assignment of.