Contents: S.E. Hyman, Foreword. Preface. C. García Coll, E.L. Bearer, R.M. Lerner, Introduction: Nature and Nurture in Human Behavior and Development: A View of the Issues. R.M. Lerner, Genes and the Promotion of Positive Human Development: Hereditarian Versus Developmental Systems Perspectives. S.J. Suomi, How Gene-Environment Interactions Influence Emotional Development in Rhesus Monkeys. M.B. Spencer, V. Harpalani, Nature, Nurture, and the Question of "How?": A Phenomenological Variant of Ecological Systems Theory. A. Fausto-Sterling, Commentary. G. Gottlieb, Normally Occurring Environmental and Behavioral Influences on Gene Activity: From Central Dogma to Probabilistic Epigenesis. R. Rende, Beyond Heritability: Biological Process in Social Context. J. Hirsch, Uniqueness, Diversity, Similarity, Repeatability, and Heritability. L. Braun, Commentary. W.T. Dickens, J.L. Cohen, Instinct and Choice: A Framework for Analysis. E.L. Bearer, Behavior as Influence and Result of the Genetic Program: Non-kin Rejection, Ethnic Conflict, and Issues in Global Health Care. W.F. Overton, Embodied Development: Ending the Nativism-Empiricism Debate. C. García Coll, E.L. Bearer, R.M. Lerner, Conclusions: Beyond Nature Versus Nurture to More Complex, Relational, and Dynamic Developmental Systems.