This book contains all of the abstracts of the 16th World Congress of the Interna­ tional Association for Child and Adolescent Psychiatry and Allied Professions (IA­ CAPAP) held in Berlin, Aug 22-26, 2004. The abstracts are arranged according to the type of session (main lecture, state of the art lecture, symposium, workshop, course, or poster exhibition) and the day of the conference. The abstracts of the industry-sponsored sessions are also in­ cluded. A subject index is provided to help track themes of special interest. The author index allows you to find the abstract authors and the address of the first author for direct contact. The general theme of the congress "Facilitating Pathways: Care, Treatment and Prevention in Child and Adolescent Mental Health" is quite inclusive and the contri­ butions to the Congress, as reflected in the abstracts, cover the whole range of child and adolescent mental health endeavour, including all modern methods and trends in research and clinical application. The ways we understand and treat our patients are changing rapidly, and this too is reflected in the contributions to this volume, which give state-of-the-art information that should allow us to provide better care, treatment and prevention to children, adolescents and their care-givers everywhere in the world.