The International Virtual Observatory Alliance (IVOA)[1] is a worldwide scientific organisation formed in June 2002. Its mission is to facilitate international coordination and collaboration necessary for enabling global and integrated access to data gathered by astronomical observatories. An information system allowing such an access is called a virtual observatory. The main task of the organisation so far has focused on defining standards to ensure interoperability of the different virtual observatory projects already existing or in development.
The IVOA now comprises 19 VO projects from Argentina, Armenia, Australia, Brazil, Canada, China, Europe, France, Germany, Hungary, India, Italy, Japan, Korea, Russia, Spain, Ukraine, the United Kingdom, and the United States. Membership is open to other national and international projects according to the IVOA Guidelines for Participation.
Senior representatives from each national VObs project form the IVOA Executive Committee. A chair is chosen from among the representatives and serves a 1.5 year term, preceded by a 1.5 year term as deputy chair. The Executive Committee meets 3-4 times a year to discuss goals, priorities, and strategies.