This series of dictionaries provides comprehensive, up-to-date definitions in each subject. They are fully cross-referenced. The dictionaries arose out of the author's dissatisfaction with existing works which arc incomplete, and either require an in depth knowledge of psychology to make use of them, or are written solely for the beginner. 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 definitions are in greater depth, and are cross-referenced to a greater extent, than other dictionaries. The first three volumes in the series cover developmental and cognitive psychology and psychological testing, assessment and treatment. A complete dictionary of psychology will be published in 1994. The "Dictionary of Cognitive Psychology" provides over 2000 definitions of key terms in cognition. It includes not only comprehensible and comprehensive definitions of terms, but explanations of key experiments and theories.