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The authors report on continuities and discontinuities in the expression of
temperamental characteristics from early infancy to adolescence of the subjects in the New York Longitudinal Study. The findings are interpreted in terms of a model in which organism-environment interaction is considered to produce new behavioral patterns of succeeding age periods. As these new patterns interact with recurrent and new features of the environment, in some instances the same temperamental factors that were influential in the past continue to be influential; in other instances different aspects of temperament become ascendant, or the influential temperamental attributes may be distorted, or temperamental issues may dwindle in significance.