Attachment theory and research have emphasized the importance of under
standing the individual as existing withing a network of relationships
. The idea of development being relationship based, and interactions w
ith the primary caretaker leading toward the internalization of a rela
tionship experience, is quite different from and complements psychoana
lytic ideas about development. In this article, attachment as a relati
onship approach for understanding development is contrasted with relev
ant psychoanalytic perspectives. Current theoretical and research conc
epts focusing on affect development and the evolution of the parent-in
fant relationship are discussed. A broader understanding of attachment
is presented, which includes two ideas. The first is that internal re
presentations build on internal working models of development. The sec
ond is that the attachment concept, combined with systems theory, is a
way to conceptualize aspects of family theory and therapy. Finally, c
linical implications of attachment theory and research are discussed.