As with national association meetings, the segment encompasses a wide range of organisations which can be governmental, professional, scientific or social in nature. However, it is usually the medical, scientific and pharmaceutical meetings which are the most attractive both in terms of attendance and revenue. IT and telecommunications has also been a major industry sector using this form of communication but recent changes in the US economy and in the telecoms industry itself have certainly reduced congress demand from this sector, which had traditionally been a stable source of meetings. It would be impossible to put a figure on the number of international associations in.