Acknowledgements This Volume could not exist without the contributors of its papers. We would like to thank them on behalf of the Symposium organisers, for their support in making this a very successful conference. The editors would also like to thank all reviewers for their help in selecting quality papers. Organising such international events is not easy without the support of sponsors. We would like to thank TELENOR, which was very generous in accepting to host this conference under its Patronage. Our sincere thanks also go to all industrial sponsors and to the members and staff of the European Commission, who provided support of various kinds. In particular we would like to thank Dr. Paulo de Sousa of the European Commission, who helped us integrating the NGN concertation activity into the conference, and Ms. May Krosby of Telenor, who took care of the Secretariat. Last but not least, our sincere thanks to committee members who provided timely help in realising this conference andto our publishers Springer-Verlag for bringing out an excellent volume in time for the conference.