Acceptance and Commitment Therapy (ACT) Explained

Acceptance and Commitment Therapy (ACT) is a form of psychotherapy that combines mindfulness practice with behavioural strategies. Rather than working to remove difficult thoughts and feelings, it works on a person's relationship to them, alongside action guided by what that person values.

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What Is ACT?

ACT is a form of psychotherapy that teaches ways of responding to difficult thoughts and feelings. Instead of trying to control or remove unwanted thoughts, ACT works towards accepting that they are present, so that a person can still take actions that fit their values. Mindfulness techniques are used to help people notice their thoughts and feelings without being overwhelmed by them.

ACT is built on the view that persistent efforts to avoid unwanted feelings can add to a person's distress rather than reduce it. It encourages meeting difficult thoughts with openness, and taking action that matters to the person even while those thoughts are present.

What are the key concepts of ACT?

ACT is founded on six core processes that together aim to increase psychological flexibility: the capacity to stay in contact with present experience and to change or persist in behaviour according to what a person values.

• Cognitive defusion: techniques that reduce the tendency to take thoughts, memories or feelings literally, so that a thought can be noticed as a thought rather than as an instruction to act.
• Acceptance: making room for unwanted feelings and thoughts as part of human experience, instead of avoiding or suppressing them, which reduces the effort spent struggling with them.
• Contact with the present moment: attending to what is happening now, directly and without judgement, rather than being caught in the past or the future.
• Self as context: developing a steady vantage point from which a person can observe their own thoughts and feelings, distinct from the content of those thoughts.
• Values clarification: identifying what genuinely matters to the person, so that these can guide how they choose to live.
• Committed action: setting goals based on those values and acting on them, including at times when difficult experiences are present.

What to Expect During ACT Sessions

ACT sessions combine conversation with mindfulness exercises and reflection on values and goals. Early sessions usually focus on cognitive defusion and acceptance skills, through exercises that encourage a different relationship with one's thoughts and feelings.

As therapy continues, more attention goes to identifying values and to committed action. Therapists commonly use metaphor, paradox and mindfulness exercises as teaching tools. Between-session tasks are common, so that skills are practised in everyday settings.

ACT has no set number of sessions; the length depends on what the person is working on and what they and their therapist agree. Progress in ACT is judged not by whether difficult thoughts or feelings have gone, but by whether the person is acting more often in line with what they value.

What Issues Can ACT Help?

ACT has been applied to a range of difficulties, among them depression, anxiety, stress, chronic pain and relationship problems. It is often considered for people who have found that trying to suppress or argue with their feelings has not reduced their distress.

ACT tends to suit people who want practical ways of handling difficult inner experiences and who want their choices guided by what they value. It also suits people who are comfortable with mindfulness practice and willing to look at how their thoughts and feelings shape what they do.

ACT asks for active participation, in sessions and between them. Much of the work depends on the person practising the skills in daily life, which is worth knowing before starting.

The Pros and Cons of ACT

Strengths of ACT

• Psychological flexibility as the target: ACT works on the capacity to respond to situations with openness, awareness and attention to values, rather than on removing symptoms directly.
• A substantial research base, unevenly distributed: ACT has been examined in a large number of randomised controlled trials, and it appears in treatment guidance for conditions including chronic pain and depression. The Association for Contextual Behavioral Science maintains a public register of those trials and of the guidelines that include ACT. How strong the evidence is varies by condition, so it is reasonable to ask a therapist what the research shows for your particular difficulty.
• Values are made explicit: ACT asks the person to clarify what matters to them, and uses that as the reference point for the work rather than a therapist's or a protocol's goals.
• Acceptance skills: the approach offers concrete ways of staying with difficult thoughts and feelings instead of fighting them.
• Mindfulness is built in: attention training is part of the method rather than an add-on.

Limitations and Demands of ACT

• It requires active participation: ACT asks for regular practice and for applying the work outside sessions. This level of engagement does not suit everyone, and it can be difficult at times when a person has little capacity for it.
• It can feel counterintuitive: the emphasis on accepting rather than eliminating unwanted thoughts can sit uncomfortably with someone who has come to therapy to have a problem removed.
• Access to trained therapists varies: therapists with specific ACT training are not equally available everywhere, and the work depends on the therapist's training and their ability to adapt the approach to the person in front of them.
• It is not indicated for everyone: ACT is one of several evidence-informed approaches, and another therapy may be a better fit depending on the difficulty, the person's preferences and their circumstances.

Is ACT the Right Therapy for You?

If ACT interests you, the first step is finding a suitably qualified therapist. Look for therapists with training and experience in ACT, and consider an initial consultation to discuss what you are hoping to work on and whether their approach fits.

ACT is not the right approach for every person or every difficulty. A therapist can help you weigh it against other options, and it is appropriate to ask why they are recommending one approach over another. Like any therapy, ACT takes time and commitment, and outcomes differ from person to person.

Conclusion

ACT offers a set of methods for responding to difficult thoughts and feelings, and for acting in line with what a person values while those thoughts and feelings are present. It asks for active participation, and it is not the right fit for everyone. Whether it suits you is a question worth putting to a therapist trained in it, alongside the other approaches available to you.

Key Takeaways

• ACT aims to help people accept what is outside their control and commit to actions that fit their values. It rests on six core processes directed at psychological flexibility: the capacity to adapt to situations with openness, mindfulness and attention to values.
• ACT has been researched across a range of difficulties, among them anxiety, depression, stress and chronic pain. The strength of the evidence is not the same for every condition, and it is reasonable to ask a therapist what the research shows for yours.
• ACT asks for active engagement, including practising skills outside sessions. It also challenges the common expectation that therapy should remove unwanted thoughts and feelings, since it emphasises acceptance rather than elimination.

Frequently Asked Questions

How long does ACT therapy typically last?

There is no set length, and ACT is usually delivered as a short-term course. Trial protocols give a rough sense of scale: a 2026 meta-analysis of 91 controlled trials (6,639 participants) reported that psychological distress was reduced at nine of the seventeen session doses studied, with eight sessions identified as the optimal dose and four as the minimal one. Those figures describe research protocols rather than any individual's course of therapy. In practice the duration depends on what the person is working on, how things progress, and what they and their therapist agree between them.

Is ACT done one-on-one or in a group?

ACT is used in both one-to-one and group settings. Which is offered depends on the therapist's approach, what is available locally, and the person's preference.

Can ACT be used alongside other therapies?

Yes. ACT is often combined with other therapeutic approaches, and elements of it are used within broader treatment plans.

References

• Association for Contextual Behavioral Science. Acceptance and Commitment Therapy (ACT). Accessed 16 August 2026. https://contextualscience.org/act
• Association for Contextual Behavioral Science. State of the ACT Evidence. Updated June 2026. Accessed 16 August 2026. https://contextualscience.org/state_of_the_act_evidence
• Khazaie, H., Maroufi, A., Khazaie, A., Komasi, S., & Yasamy, M. T. Optimal and Minimal Doses of Acceptance and Commitment Therapy to Improve Psychological Distress: A Meta-Analysis, Meta-Regression, and Subgroup Analysis of Controlled Trials. Administration and Policy in Mental Health, 2026. https://doi.org/10.1007/s10488-026-01490-1
• Lifeline Australia. Acceptance and Commitment Therapy (ACT). Accessed 16 August 2026. https://www.lifeline.org.au/get-help/support-toolkit/techniques-and-guides/acceptance-and-commitment-therapy-act