Contents: F.G. Ashby, Multivariate Probability Distributions. Part I:Similarity, Preference, and Choice.J.L. Zinnes, D.B. MacKay, A Probabilistic Multidimensional Scaling Approach: Properties and Procedures. G. De Soete, J.D. Carroll, Probabilistic Multidimensional Models of Pairwise Choice Data. U. Bo"ckenholt, Multivariate Models of Preference and Choice. D.M. Ennis, K. Mullen, A General Probabilistic Model for Triad Discrimination, Preferential Choice, and Two-Alternative Identification. N.A. Perrin, Uniting Identification, Similarity and Preference: General Recognition Theory. Part II:Interactions Between Perceptual Dimensions.W.T. Maddox, Perceptual and Decisional Separability. H. Kadlec, J.T. Townsend, Signal Detection Analyses of Dimensional Interactions. T.D. Wickens, L.A. Olzak, Three Views of Association in Concurrent Detection Ratings. Part III:Detection, Identification, and Categorization.J.P. Thomas, L.A. Olzak, Simultaneous Detection and Identification. D.M. Ennis, Modeling Similarity and Identification When There Are Momentary Fluctuations in Psychological Magnitudes. A.A.J. Marley, Developing and Characterizing Multidimensional Thurstone and Luce Models for Identification and Preference. Y. Takane, T. Shibayama, Structures in Stimulus Identification Data. R.M. Nosofsky, Exemplar-Based Approach to Relating Categorization, Identification, and Recognition. M.M. Cohen, D.W. Massaro, On the Similarity of Categorization Models. F.G. Ashby, Multidimensional Models of Categorization.