Abstract
Joreskog's LISREL model is applied to the case of longitudinal data. However, instead of postulating causal relationships between individual differences obtained at successive points in time, the developmental model proposed here, assumes causal relationships between initial individual differences and individual differences in subsequent intraindividual changes over a specified time interval. More specifically, causal relationships are postulated at two levels: (a) factor scores, and (b) factor loading patterns. It is possible to define four prototypes of developmental continuity/discontinuity that may characterize actual change phenomena.

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