I Neo-Kraepelinian Approach to Classification.- 1 Kraepelin and His Influence On Modern Classification.- Emil Kraepelin.- Adolph Meyer.- Modern American Psychiatric Classification.- Recent Changes in Psychiatric Classification.- Suggested Readings.- 2 The Neo-Kraepelinian Movement In American Psychiatry.- The Neo-Kraepelinian Credo.- Central Members of the Neo-Kraepelinian Movement.- The Feighner Paper.- Sociology of Science and the Feighner Paper.- Diagnostic Criteria and the Feighner Paper.- Diagnostic Criteria and Reliability.- Diagnostic Criteria and Coverage.- Concluding Comments.- Suggested Readings.- 3 The Neo-Kraepelinian Movement and the Medical Model.- The Medical Model.- Definition #1 of Guze.- Definition #2 of Guze.- Definition #3 of Guze.- Spitzer¿s Definition.- Professional Jurisdiction.- Earnings.- Manpower.- Insurance.- Professional Jurisdiction and Classification.- The Medical Model Revisited.- Wing¿s Two Definitions of Mental Illness.- The Demarcation Problem.- Suggested Readings.- 4 Diagnostic Reliability.- Historical Review of Diagnostic Reliability.- Pre-1950s Research.- Studies from the 1950s.- Kreitman¿s Review.- Three Articles by Beck et al.- Sandifer, Pettus, and Quade.- Zubin¿s Review.- Comparison of British and American Diagnosticians.- Review by Spitzer and Fleiss.- The Overemphasis on Reliability.- Concluding Comments.- Suggested Readings.- 5 DMS-III.- Innovation 1: Diagnostic Criteria.- Innovation 2: Multiaxial Diagnosis.- Innovation 3: Descriptive Information about Categories.- Innovation 4: Diagnostic Categories.- Schizophrenia.- Childhood Disorders.- Concluding Comments.- Suggested Reading.- II Quantitative Approaches to Classification.- 6 An Overview of Multivariate Models and Methods.- Models of Classification.- Categorical Model.- Dimensional Model.- Contrast of Dimensional and Categorical Models.- Hierarchical Model.- Circumplex Model.- Hybrid Model.- Multivariate Statistical Methods.- Exploratory Methods.- Confirmatory Methods.- Final Remarks.- Suggested Readings.- 7 Factor Analysis and Psychopathology.- An Introduction to Factor Analysis.- Step I: Obtaining Descriptive Data.- Step II: Forming a Correlation Matrix.- Step III: Factoring the Correlation Matrix.- Step IV: Number of Factors.- Step V: Rotation of the Factors.- Factor Analysis of the Complete Moore Data.- Review of Factor-Analytic Studies of Psychotics.- Moore.- Wittenborn.- Lorr.- Overall.- Factor Studies of Depression.- Methodological and Theoretical Comments.- Sampling.- Factor Methodology.- Reification.- Confirmatory Factor Analysis.- Suggested Readings.- 8 Cluster Analysis and the Classification of Patients.- to Cluster-Analytic Methods.- Alcoholism and Cluster Analysis.- Cluster Analysis and Studies of Depression.- The Future of Cluster Analysis.- Studies of Clustering Methodology.- How to Perform Cluster Analysis.- Theory Formulation and Cluster Analysis.- Suggested Readings.- Epilogue.- Appendix I. Classifications of Psychopathology.- Appendix II. Cluster-Analytic Studies of Psychopathology.- References.- Author Index.