The G-20 was created as a response both to the financial crises of the late 1990s and to a growing recognition that key emerging-market countries were not adequately included in the core of global economic discussion and governance. Prior to the G-20 creation, similar groupings to promote dialogue and analysis had been established at the initiative of the G-7. The G-22 met at Washington D.C. in April and October 1998. Its aim was to involve non-G-7 countries in the resolution of global aspects of the financial crisis then affecting emerging-market countries. Two subsequent meetings comprising a larger group of participants (G-33) held in March and April 1999 discussed reforms of the global economy and the international financial system. The proposals made by the G-22 and the G-33 to reduce the world economy's susceptibility to crises showed the potential benefits of a regular international consultative forum embracing the emerging-market countries. Such a regular dialogue with a constant set of partners was institutionalized by the creation of the G-20 in 1999.

(Source:http://www.g20.org)