Contents: Part I:Individual Differences in Infancy: Overviews. F.D. Horowitz, Developmental Models of Individual Differences, E. Thelen, Dynamical Systems and the Generation of Individual Differences. L.A. Thompson, Genetic Contributions to Early Individual Differences. J.A. Green, Analyzing Individual Differences in Development: Correlations and Cluster Analysis. Part IIIndividual Differences in Neurobehavioral Development. E.B. Thoman, M.P. Whitney, Behavioral States in Infants: Individual Differences and Individual Analyses. J. Worobey, Behavioral Assessment of the Neonate. Part III:Information Processing and Output. J.W. Fagen, P.S. Ohr, Individual Differences in Infant Conditioning and Memory. J. Colombo, D.W. Mitchell, Individual Differences in Early Visual Attention: Fixation Time and Information Processing. S.A. Rose, J.F. Feldman, Infant Cognition: Individual Differences and Developmental Continuities. H.A. Ruff, Individual Differences in Sustained Attention During Infancy. B.A. Morrongiello, The Study of Individual Differences in Infants: Auditory Processing Measures. L.P. Acredolo, Individual Differences in Infant Spatial Cognition. A. Fogel, The Process of Developmental Change in Infant Communicative Action: Using Dynamic Systems Theory to Study Individual Ontogenies. D. Thal, E. Bates, Continuity and Variation in Early Language Development. Part IV:Temperament and Socioemotional Development. M.R. Gunnar, The Psychobiology of Infant Temperament. M.K. Rothbart, J.A. Mauro, Questionnaire Approaches to the Study of Infant Temperament. R. Plomin, J. Campos, R. Corley, R.N. Emde, D.W. Fulker, J. Kagan, J.S. Reznick, J. Robinson, C. Zahn-Waxler, J.C. DeFries, Individual Differences During the Second Year of Life: The MacArthur Longitudinal Twin Study.