This article reviews the role of attachment in difficult-to-treat pati
ents. It is suggested that difficulty often arises in the treatment of
these patients because of their inadequate understanding of mental fu
nctioning in themselves and in others. The capacity to mentalize is se
en as a function of early attachment relationships. Vulnerability intr
oduced by insecure attachment is frequently compounded by a history of
intense trauma, leading these patients to defensively inhibit their c
apacity to think about mental states in their abusers, which then gene
ralizes to other attachment relationships. The clinical implications o
f this model are discussed.