In essence, it was intended to broaden the scope of risk coverage, and to bring in some flexibility to accommodate differences in banks’ business models and in the sophistication of their risk management. Among other things, Basel II:   introduced the three-pillar structure into the prudential framework, those pillars being the minimum capital standard, supervisory oversight, and disclosure.
So the framework was expanded beyond a simple reliance on the minimum capital ratio;    it introduced a framework of capital requirements to cover operational and other risks.