It is distinctive due to its intensive use of reformulation, its integration of cognitive and analytic practice and its collaborative nature, involving the patient very actively in their treatment.
The CAT practitioner aims to work with the patient to identify procedural sequences; chains of events, thoughts, emotions and motivations that explain how a target problem (for example self-harm) is established and maintained.
[2]: 197 Ryle, a general practitioner and analytically trained psychotherapist, was undertaking research into psychotherapy practice using repertory grids in the 1970s.
[4] Subsequently, CAT has been influenced by ideas from the work of Soviet psychologist Lev Vygotsky and Russian philosopher Mikhail Bakhtin.
[5] The ZPD implies that new tasks set for the patient (for example, tolerating anxiety about social situations) should extend what they do beyond their current capabilities, but only by a small and achievable amount.
This is a structured attempt to identify and visually display sequences of behaviour, thinking, and emotions so that the patient becomes more aware of these and can start to modify them.
The aim of the therapy is to enable the client to recognise these patterns, understand their origins, and subsequently to learn alternative strategies in order to cope better.
In the first quarter of the therapy (the Reformulation phase) the therapist collects all the relevant information, asking the patient about present day problems and also earlier life experiences.
The approach is too new for any systematic reviews of RCTs to have been conducted, and therefore is not yet explicitly recommended by name by the UK National Institute for Health and Clinical Excellence (NICE).
[12] A different trial suggested that CAT for adult patients with personality disorders also showed improvements in symptoms and interpersonal functioning, as against controls who deteriorated on these measures.
[14] An RCT of the use of a CAT-informed assessment for young people who had self-harmed suggested that it was effective in increasing rates of attendance at community follow-up.