The First Conference 1986 in Tübingen, Germany

The Second Conference 1988 in Vierhouten, the Netherlands

The Third Conference 1990 in Aosta, Italy

The Fourth Conference 1992 in Brussels, Belgium

The Fifth Conference 1994 in Hondarribia, Spain

The Sixth Conference 1996 in Hoddesdon, the United Kingdom

The Seventh Conference 1998 in New Delhi, India

The Eighth Conference 2000 in Washington, D.C., USA

The Ninth Conference 2002, near Berlin, Germany

The Tenth Conference 2004, Brussels, Belgium

The Eleventh Conference, 2006, Woltersdorf, near Berlin, Germany