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Lecture 2 CLASSIFICATION Lecture Outline I. Introduction II. Historical Systems III.General Problems IV. The Diagnostic and Statistical Manuals A. DSM I B. DSM II C. DSM III D. DSM III-R V. General Classification Issues A. Natural Kinds B. Language VI. Diagnosis and Classification ------------------------------------------ I. Introduction We have discussed some of the issues involved in defining "abnormal behavior" per se. But clearly, "defining" does not stop there. Even the lay person is aware that there exist various types of abnormal behaviors. The task for the psychologist, then, is to specify what these different types are. Some classification system is necessary. Botanists would never have advanced their field without a clear taxonomy for classifying plants. Mere "Plant" - "Not Plant" distinctions would not be very fruitful! So, too, we need to have a system that allows us to identify the different types of disorders which fall under the rubric of "Abnormality". Importance of classification (see, for example, Blashfield & Draguns, 1976): A. Description - identification of...

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