(93)In December 2010, the BCBS published guidelines defining the methodology for calculating the leverage ratio. Those rules provide for an observation period that will run from 1 January 2013 until 1 January 2017 during which the leverage ratio, its components and its behaviour relative to the risk-based requirement will be monitored. Based on the results of the observation period the BCBS intends to make any final adjustments to the definition and calibration of the leverage ratio in the first half of 2017, with a view to migrating to a binding requirement on 1 January 2018 based on appropriate review and calibration. The BCBS guidelines also provide for disclosure of the leverage ratio and its components starting from 1 January 2015.