how is basel i different from basel ii and basel iii 
basel i introduced guidelines for how much capital banks must keep in reserve based on the risk level of their assets basel ii refined those guidelines and added new requirements basel iii further refined the rules based in part on the lessons learned from the worldwide financial crisis of 2007 to 2009 the bottom linebasel i was the earliest of the three basel accords and introduced capital reserve requirements for banks based on the riskiness of their assets it has since been supplemented by basel ii and basel iii 