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LIT-555: Acceptance and Commitment Therapy: Model, Processes and Outcomes

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Properties5
StatusActive — read in full 2026-10-03 (NOTE-431), but in an early manuscript, not the published text; worth reading as the canonical statement of the ACT model of psychopathology, "psychological inflexibility", and of the six processes ACT targets. Cognitive fusion and experiential avoidance (from LIT-551) narrow behaviour, and acceptance, defusion, present-moment contact, self as context, values and committed action restore flexibility. The copy read is an author manuscript in Georgia State University's repository that still carries "xx" placeholders, and its numbers differ from the published paper's as Kashdan and Rottenberg report them (21 studies against 32; an AAQ correlation printed ".030" against ".42"). Use its model and argument, not its numbers. Its own verdict on the evidence is "broadly supportive" but "not mature".
Tagspsychopathology-and-treatment, cognition, emotion-and-affect, self, social-science
ExtendsLIT-551 — Experiential Avoidance and Behavioral Disorders: A Functional Dimensional Approach to Diagnosis and Treatment, LIT-549 — Relational Frame Theory: A Post-Skinnerian Account of Human Language and Cognition
Cited as “paper” byNOTE-431 — Acceptance and Commitment Therapy: Model, Processes and Outcomes
Cited as “source” byTHEORY-044 — In relational frame theory the self is verbal behaviour's content, its process and its context, and the self as context is a perspective learned from deictic relations that cannot itself be found as content, THEORY-050 — Psychological inflexibility, in which verbal relations give private events aversive functions and make experiential avoidance a general strategy, is a transdiagnostic process in psychopathology, THEORY-051 — Strengthening the self as context, a perspective from which thoughts about oneself are held as thoughts, is a process by which acceptance and commitment therapy reduces suffering

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Steven C. Hayes, Jason B. Luoma, Frank W. Bond, Akihiko Masuda and Jason Lillis (2006), Behaviour Research and Therapy 44(1):1–25 — DOI-10.1016/j.brat.2005.06.006

Key takeaways

  • The model. The main source of psychopathology is “the way that language and cognition interacts with direct contingencies to produce an inability to persist or change in the service of long term valued ends”. Cognitive fusion, behaviour governed by verbal networks rather than by the contingencies, supports experiential avoidance. Together they shrink contact with the present, harden a conceptualized self, and push values aside. The result is psychological inflexibility.
  • The treatment. Psychological flexibility is “the ability to contact the present moment more fully as a conscious human being, and to change or persist in behavior when doing so serves valued ends”. It is built through six processes: acceptance, defusion, being present, self as context, values and committed action. ACT is defined by these processes, “not a specific technology”.
  • The evidence, as the authors weigh it. Correlational, component, mediational and outcome studies are “broadly supportive”. There are not enough well-controlled trials to call ACT more effective than other active treatments. Where ACT and cognitive therapy were compared, they appear to change different processes.

Standing in the record

Filed on 2026-10-03 at the owner’s request, as the read statement of the ACT model, the most-cited account of psychological flexibility and the one the psychopathology-and-treatment blurb points to. No anthology topic holds it, and it carries no instruction for machine-learning practice.

It carries two earlier works further, and the extends relations name them:

  • Experiential avoidance (LIT-551). The review defines experiential avoidance with the 1996 paper’s words and makes it one of the six inflexibility processes, now fed by cognitive fusion. Without that construct the model has no account of why people narrow their lives.
  • Relational Frame Theory (LIT-549). The review calls ACT “the applied extension” of the RFT programme and derives its four implications for psychopathology from the book (p. 6): normal verbal processes underlie suffering; context controls the impact of cognitive networks; networks are historical and are not eliminated; and direct attempts to change them elaborate them. The read statement of RFT is LIT-541.

Later papers build on it. Kashdan and Rottenberg (LIT-553) place ACT’s flexibility among other literatures on flexibility and cite this review’s meta-analysis. Macri and Rogge (LIT-543), unread, meta-analyse its six-process model as a set of treatment mechanisms. Hayes and Hofmann’s process-based therapy (2019), filed in parallel by another agent, widens the same process focus beyond ACT.

Which version. Only an early author manuscript could be read lawfully. Its model and argument match the published abstract. Its numbers are not the published ones and should not be quoted from this record without the version of record (see NOTE-431, Corrections).

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