Those that have introduced quotas have seen more immediate increases in the number of women on boards, while those that have taken a softer approach, using disclosure or targets, have seen a more gradual increase over time (Box 14.1). Most countries either require businesses to disclose the gender balance on their boards or, as part of their corporate governance codes, compel companies to comply or explain. Since 2011 companies listed on the FTSE 100 index of big firms have been encouraged to ensure that at least 25% of board members are women, with the voluntary challenge later widened to all firms listed on the larger FTSE 350 index, and increased with companies now asked to reach 33% female board members by 2020.