Advances in Clinical Child Psychology is a serial publication designed to bring together original summaries of the most important new develop ments in the field of clinical psychology and its related disciplines. Each chapter is written by a key figure in an innovative area of research or by an individual who is particularly well qualified to comment on a topic of major contemporary importance. These chapters provide convenient, concise explorations of empirical and clinical advances in the field. The chapter topics are chosen by the editors and are based on sug gestions by the advisory editors, unsolicited suggestions provided by colleagues, and from all of our reading of the latest published empirical and theoretical works. As such, it reflects our collective perception of the trends that are leading the field of clinical child psychology. Those trends are clearly evident in Volume 9. Two chapters describe the cur rent state of the art of intellectual and neuropsychological measurement. Two chapters discuss the classification and origins of the two types of attention deficit disorders. And one chapter focuses on the developmen tal importance of adolescence in child and family dysfunctions. But the overwhelming theme of this volume is the relationship between biolog ical and psychological variables. In choosing these chapters, we believe that we are merely reflecting the changing nature of research in the field."