The worsening of the financial crisis in September 2008, coinciding with the collapse of Lehman Brothers, set off unprecedented action in the European states to support the stability of their markets and financial institutions. Different forums asked for joint and faster implementation. This lead the Spanish authorities to take a series of measures. In the first part of this paper we make a theoretical review of previous studies at international level on early warning systems and about prediction of failure in the banking sector. No doubt it helps to situate and understand better the later Spanish analysis, why it is necessary and its development. We also analyze the evolution of the Spanish financial system between 2008-2011 with the focus on explaining the reform and restructuring of savings banks. Specifically, a study of the accounting and financial standards evolution is made, as well as an examination of the changes in banking regulations that emerged during this period and the role of the Banking Management Restructuring Fund (FROB) and the Institutional Protection Systems (SIP).FROB, SIP, banking regulation changes, early warning systems.