Presents a summary of research findings that suggests that the qualitative nature of 1-yr-olds' attachment to their mothers is related both to earlier mother-infant interaction and to various aspects of their later development. The way in which they organize their behavior toward their mothers affects the way in which they organize their behavior toward other aspects of their environment, both animate and inanimate. This organization provides a core of continuity in development despite changes that come with cognitive and socioemotional developmental acquisitions. Despite the need for further research into children's attachment to their parents and to other figures, findings to date provide relevant leads for policies, education in parenting, and intervention procedures to further the welfare of infants and young children. (33 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved). © 1979 American Psychological Association.