Just as each person develops from infancy to adulthood, all interpersonal relationships have a life history that encompasses the changes in how people communicate with each other. This book is about how a relationship transforms itself from one pattern of communication to another. Looking specifically at the mother-infant relationship, the authors present a unique research method called relational-historical research, based on advances in dynamic systems theory in developmental psychology, and qualitative methods in life history research. The result is a compelling piece of research. It will have international appeal.