Attachment-based psychotherapy is a psychoanalytic psychotherapy that is informed by attachment theory. As a branch of relational psychoanalysis, attachment-based psychotherapy combines the epidemiological categories of attachment theory including the identification of the attachment styles secure, anxious, avoidant, ambivalent and disorganised attachments with an analysis and understanding of how dysfunctional attachments get represented in the human inner world and subsequently re-enacted in adult life. Ongoing clinical developments are discussed in the journals ATTACHMENT: New Directions in Psychotherapy and Relational Psychoanalysis, Karnac Books:London (ISSN 1753 5980) (journal of the Centre for Attachment-based Psychoanalytic Psychotherapy, London) and Attachment and Human Development, Brunner-Routledge: London & New York (journal of the International Attachment Network).