Abstract
Principles and concepts of development are reviewed in relation to life‐span issues noting the need to consider: development in its social context; timing of experiences; intrinsic and experiential factors; continuities and discontinuities; parallels and differences s between normal and abnormal development; heterotypic and homotypic continuities; key life transitions; risk and protective factors; indirect chain affects; mediating mechanisms; age as an index of maturational and experiential factors. Developmental findings from childhood to adult longitudinal studies arc reviewed for possible mediating factors. These include: genetic mechanisms; the(non‐genetic) biological substrate; shaping of the environment; cognitive and social skills: self‐esteem and self‐efficacy; habits, cognitive sins and coping styles: links between experiences

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