ICCA Congress Series no. 16 comprises the proceedings of the ICCA 50 GenevaConference 2011 hosted by the ICCA 50 Organizing Committee on 19-20 May 2011.The Conference marked a major milestone: the Golden Anniversary of ICCA. A warmword of thanks goes to the Committee for arranging this splendid celebration in thebeautiful city of Geneva, the birthplace of ICCA.