In 2005, for the first time, an expert panel named "The Bariatric Scientific Collaborative Group" (BSCG), was appointed through a joint effort of the major European Scientific Societies which are active in the field of obesity management. Societies that constituted this panel were: International Federation for the Surgery of Obesity - European Chapter (IFSO-EC), European Association for the Study of Obesity (EASO), European Childhood Obesity Group (ECOG) and the International Obesity Task Force (IOTF) which was represented during the completion process by its representatives. The BSCG was composed of officers representing the respective Scientific Societies (including four acting Presidents, two past Presidents, one Honorary President, and three Executive Directors). The panel was also balanced by the presence of many other opinion leaders in the field of obesity. The BSCG composition allowed coverage of the key disciplines in comprehensive obesity management, as well as being reflective of European geographic and ethnic diversity. This joint BSCG Expert Panel has convened several meetings which were entirely focused on guideline creation during the past 2 years. There was a specific effort to develop and concur on clinical guidelines which reflect current knowledge, expertise and evidence- based data on treatment of morbid obesity.