Furthermore, I would like to thank all the panellists and chairpersons for their extremely useful presentations and interventions at the conference as well as for their contributions to the book. I would also like to thank all the participants for their active involvement during the meeting, reviewers for their useful comments and suggestions as well as the language editor for the improvements to the material. Finally, my thanks go to all those who were involved in finalising the material, particularly Hrvoje Butković, thus making this editorial effort possible. The publication resulted from the IMO long term research activities supported by the Ministry of Science, Education and Sports. The manuscripts were received in September 2006 with minor updates before printing. Višnja Samardžija Editor 2