The series of international workshops on Retrial Queues started in Madrid, September 22-24, 1998.

The 1st International Workshop on Retrial Queues (WRQ'98) gathered 25 participants from 12 countries. The Chairman was Professor Jesus R. Artalejo. The Proceedings were published in a special issue of Top (Volume 7, Number 2, 1999).

Professor Alexander N. Dudin chaired the 2nd International Workshop on Retrial Queues (WRQ'99), Minsk, June 22-24, 1999. The workshop was conducted jointly with the 15th Belarussian Workshop on Queueing Theory. The Proceedings were published in the monograph 'Queues, Flows, Systems and Networks', Belarus State University Publications.

The 3rd International Workshop on Retrial Queues (WRQ'00) was held in Amsterdam, March 13-15, 2000, at the Tinbergen Institute. The Program Chair was Professor Henk C. Tijms from Vrije University of Amsterdam. About 23 participants from both Western and Eastern European countries, USA, Canada, Israel, Sweden and Japan attended the meeting. The European Commission gave support to the above conferences through the INTAS project 96-0828 entitled 'Advances in Retrial Queueing Theory'.

The 4th International Workshop on Retrial Queues (WRQ'02) was held in Cochin, December 17-21, 2002, at the Cochin University of Science and Technology. The conference Chairman was Professor A. Krishnamoorthy. The Proceedings were published in the book 'Advances in Stochastic Modelling', Notable Publications, Inc., New Jersey.

Professor B.D. Choi chaired the 5th International Workshop on Retrial Queues (WRQ'04) at the Telecommunication Mathematics Research Center, Korea University. This meeting was combined with a Workshop on Performance Evaluation of Telecommunication Systems.

The 6th International Workshop on Retrial Queues (WRQ'06) was held at "La Cristalera", Miraflores de la Sierra, Madrid, July 8-10, 2006. The Program Chair was Prof. A Gomez-Corral. This edition gathered 23 participants from 9 countries. A selection of original, high quality contributions will be published at the special issue "Advances in Retrial Queues" of the European Journal of Operational Research."