ABSTRACT
Only a decade ago, students of human development were routinely taught that individual differences in infant functioning in the first year of life were not predictive of later development. Despite this, many continued to pursue the question of the origins of individual differences that emerge after the period of infancy and that are so evident in human functioning across the lifespan. In fact, even in the face of all too consistent evidence indicating that individual differences were not stable from infancy to the childhood years, either in domains of intelligence or social and affective functioning, the collection of data that could radically alter this state of knowledge continued unabated.
