Developmental science rests on describing, explaining, and optimizing intraindividual changes and, hence, empirically requires longitudinal research. Problems of missing data arise in most longitudinal studies, thus creating challenges for interpreting the substance and structure of intraindividual change. Using a sample of reports of longitudinal…

Interactions between conceptual and procedural knowledge influence the development of mathematical competencies. However, after decades of research, these interrelations are still under debate, and empirical results are inconclusive. The authors point out a source of these problems. Different kinds of knowledge and competencies only show up…

Asserts that journal's three studies examining cultural influences on emotional development reflect Western cultural model, using Western scripts for how data were collected and meaningfulness attributed. Addresses: (1) search for universals versus cultural specificity; (2) effect of unit of analysis; (3) whose perspective is used when proclaiming…