Alternatively, if there were to be a 5/7  BIS central bankers' speeches  material adjustment to the calibration of the structural buffers held by the large banking institutions, it would be important to make a compensating adjustment to the countercyclical buffer in order to achieve the same overall resilience to financial vulnerabilities.
As a rough rule of thumb—and as described in the Board’s framework for implementing the CCyB, which was finalized in September 2016—the criteria for setting the CCyB are calibrated so that the CCyB will be above its minimum value about one-third of the time, assuming that vulnerabilities evolve as they did pre-crisis.