What are the universal exposition

The universal exposition are international exhibitions hosted every five years from a country in the world. The aim of universal exposition is to promote industrial and technologic progress world-wide, showing the last scientific and technologic innovations that could make better conditions of economic and social global life. The main organism that arrange the frequency and the organisation of exposition is the B.I.E., Bureau International des Expositions, born 22 November 1928 in Paris by a convenction subscribed by sevelal nations of the world. Today B.I.E has 154 states and organisms as members. In the Convenction, that is usually updated, there are the requisitions and rules of organization which every universal exposition must adopt, the relationships of organizarion between the member states and it points goals that want to obtain.

In the convenction of 1928, that came into force in 1931, there are the mian characteristics tha an universal exposition must have. Since 1931 the B.I.E. protocol has distinguished tho types of Expositions but the terms of this classification undergo a chance in the time and they are recognized three phases of the history of Expo Classification.

The first phase 1931-1980 distinguished: General Exposition, that last until one year with a break of six years (first class) and four years (second class); and Specialised Exposition that last until six months.

In the second phase, dated between 1980 and 1996, distinguished the World International Exposition (Universal Expo) that are made every ten years with a last of six months, and International Specialised Exposition, every two years with a last of six months.

At the end the third phase, began in 1996 with the protocol of 1988, whose laws are come to force and it provides for this classification:

- Registed International Exposition, know as Universal Exposition is the most important type of the Exposition (as the Milan Expo 2015) and it proposes a frequency of every five years with a minimum last of six months and there are no limits regarding spatial character, regarding the extention of the expositive way.

- Recognized International Exposition, organized in the break of two Universal Exposition with a specific subject and it last maximum three months.