Intelligence is considered in its widest sense, representing diverse view points and areas of specialization in this volume. Contributors represent an international network of intelligence and cognition researchers, coming from a wide range of countries including Germany, New Zealand, The Netherlands and the United States. This volume concentrates on a few points of special importance, that is, the changeability of intelligence and its relation to cognition. Most of the chapters in this work are original contributions to the field and were specially commissioned for this particular volume.