Now in paperback, these dictionaries provide comprehensive and up-to-date definitions in each specialist area. Definitions are written in plain English and aim to meet the reader's level of knowledge: basic terms are explained as though to a novice, more complex terms assume a higher level of knowledge, the comprehensive system of cross-referencing ensures that the reader will always be able to find a simple explanation.

The three volumes cover developmental and cognitive psychology and psychological testing, assessment and treatment. The books will be of especial interest to psychology students, but will also be invaluable to specialists in other fields who require information about specific areas of psychology.

The dictionary provides definitions of over 2000 key terms in cognition, equipping the reader to understand and use the terminology of the subject. It includes not only comprehensible and comprehensive definitions of terms, but also explanations of key experiments and theories.