This series of dictionaries provides comprehensive, up-to-date American and British definitions in each subject and are fully cross-referenced. Definitions in these dictionaries are aimed at the level of knowledge of the reader, so that basic terms are explained as though to a novice, while more complex terms are aimed at readers with an assumed greater level of knowledge (although by use of the cross-references provided a more basic explanation can usually be found). The first three volumes in the series cover developmental and cognitive psychology and psychological testing, assessment and treatment. This dictionary provides over 2000 definitions of key terms in the field of developmental psychology (including ageing). In addition to clear and comprehensive definitions of the terms, it also provides accounts of key experiments and theories, and psychometric and other tests of psychological development.