Discusses ambiguities in research that arise from the fact that chronological age reflects different components. Considers methodology, components of age as indices of different aspects of development, differential effects of experiences according to their timing, and maturational delay. (RJC)

The concept of psychosocial stress is reviewed in relation to empirical findings on the effects of different types of life events in childhood and adult life. It is concluded that the concept is too broad and that the events need to be subdivided according to their characteristics and meaning. (Author/DB)