International & Universal Expos
Right from the start the BIE identified two different categories of expositions: Universal Expos and International Expos which differ as follows:

Universal Expo
- Frequency: every 5 years
- Duration: at least 6 months
- Expo site: there are no limitations
- Theme: general interest (the entire range of human experiences) .
International Expo
- Frequency: in the intervals between two Universal Expos
- Duration: at least 3 months
- Expo site at least 25 hectares
- Theme: specialized





