摘要: Attachment theory is extended to pertain developmental changes in the nature of children's attachments parents and surrogate figures during years beyond infancy, other affectional bonds throughout life cycle. Various types are examined terms behavioral systems characteristic each ways which these interact. Specifically, following discussed: (a) caregiving system that underlies parents' their children, a comparison with parents; (b) sexual pair-bonds basic components entailing reproductive, attachment, systems; (c) friendships both childhood adulthood, underlying them, under what circumstances they may become enduring bonds; (d) kinship (other than those linking children) why be especially enduring.