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Acceptance and Commitment Therapy (ACT)

Acceptance and Commitment Therapy (ACT, often pronounced “act” as one word) is a modern psychotherapy approach that emphasizes psychological flexibility:

By Taylor Pagniello, RP, M.A.

Oct 06, 2025

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What Is Acceptance and Commitment Therapy (ACT)?

Acceptance and Commitment Therapy (ACT, often pronounced “act” as one word) is a modern psychotherapy approach that emphasizes psychological flexibility: the ability to remain present with one’s experience and commit to behaviour in alignment with valued life directions—even in the presence of distressing thoughts, emotions, or internal experiences (Hayes et al., 2011). ACT belongs to the so-called “third wave” of cognitive behavioural therapies, combining elements of mindfulness, acceptance, and behaviour change strategies.

Unlike traditional cognitive therapy approaches that place heavy emphasis on challenging or restructuring thoughts, ACT does not aim primarily to eliminate difficult internal experiences. Instead, it helps people change their relationship with those thoughts, emotions, and sensations so that they are less controlling and less obstructive to living in line with one’s values. In ACT, suffering is considered part of the human condition, and the therapeutic task is not to rid one of suffering but to reduce unnecessary struggles against it (Cleveland Clinic; Providence).

The central goal of ACT is to foster psychological flexibility—that is, being able to contact the present moment fully, change or persist in behaviour that serves one’s values, and not be dominated by internal barriers (e.g. unpleasant thoughts or feelings) (Contextual Science).

How Does ACT Work?

To understand how ACT works, it’s helpful to see the conceptual underpinnings and the mechanisms of change. Below are key elements of ACT’s working model, supplemented with practical illustrations.

Theoretical Foundations

Functional Contextualism & Relational Frame Theory (RFT). ACT is grounded in a philosophy called functional contextualism (focus on behaviour in context, not just content) and draws on relational frame theory (a behavioural theory of human language and cognition). RFT helps explain how language and complex cognition can create patterns of psychological suffering (e.g. merging with thoughts, rigid verbal rules).
The Hexaflex / ACT Model. The core therapeutic model in ACT is often depicted as a hexagon (sometimes called the hexaflex), comprising six interrelated processes (Acceptance, Cognitive Defusion, Contact with the Present Moment, Self as Context, Values, and Committed Action). These processes interact to cultivate psychological flexibility.

Mechanisms of Change

ACT functions by targeting experiential avoidance and cognitive fusion—two common barriers to psychological flexibility—and by building alternative skills that enable more adaptive responding:

Experiential avoidance refers to attempts to avoid, suppress, or escape internal experiences (emotions, thoughts, sensations) even when doing so causes harm over time.
Cognitive fusion occurs when people become entangled with their thoughts—treating them as literal truths and letting them dominate behaviour.

By reducing the dominance of avoidance and fusion, ACT helps clients shift toward actions consistent with their values, regardless of internal obstacles.

In practice, ACT uses metaphors, experiential exercises, mindfulness practices, and committed action plans to promote acceptance, distancing from unhelpful thoughts, clarity about values, and purposeful behaviour change.

A Simple Illustration

Imagine someone with social anxiety who thinks, “If I speak up, people will judge me; I’ll be humiliated.” In a cognitive therapy model, the therapist might challenge that thought (e.g. “What evidence do you have?”). In contrast, in ACT:

The person might practice defusion—noticing the thought as “just a thought”—“I’m having the thought ‘people will judge me’” rather than I am judged.
They might engage in acceptance of the anxiety or fear that arises in social situations, rather than trying to suppress or avoid it.
They might contact the present moment with mindfulness, noticing bodily sensations, surroundings, and the flow of experience.
They might explore or reaffirm values (e.g. connection, contribution) and decide what kind of person they want to be in those social interactions.
Then they make a committed action (e.g. speaking up even though anxiety is present) guided by that value—even if discomfort arises.
Over time, they cultivate a sense of self as context, seeing themselves as more than their anxious thoughts or sensations.

Through repeated practice, the person becomes less dominated by internal barriers and more able to act in line with meaningful values.

What Are the 6 Steps (Processes) of ACT?

It’s more accurate to call them “six core processes” rather than steps, because they are fluid and interactive rather than purely sequential. But many writers and practitioners present them in a helpful order for teaching. Below is a typical ordering and description:

Acceptance – making room for internal experiences (thoughts, feelings, bodily sensations) rather than fighting or avoiding them. Acceptance is an active process of opening up to these experiences.
Cognitive Defusion – distancing from thoughts so they lose their literal or dominating power. For example, seeing thoughts as words in the mind rather than statements of fact.
Contact with the Present Moment (Mindfulness / Being Present) – engaging fully with what is happening right now, without excessive rumination about past or future.
Self as Context – also sometimes called the “observing self,” this refers to cultivating the vantage point from which one can notice thoughts, emotions, sensations without being fused to them. You are more than your experiences.
Values – clarifying what matters to you, what you want your life to be about, and using that clarity to guide decisions. Values are chosen directions, not goals per se.
Committed Action – taking concrete, value-guided behavioral steps—even in the presence of discomfort. This resembles behavioral activation and goal-setting, but with values as the compass.

These six processes are not independent; they intertwine. For example, mindfulness helps defusion, which in turn supports acceptance; clarifying values helps guide committed action, and so on.

Some sources group them into two clusters:

Mindfulness & acceptance cluster: acceptance, defusion, contact with present moment, self as context
Commitment & behaviour change cluster: values, committed action (though the first cluster also supports the second).

Who or What Is ACT Used For?

One of ACT’s strengths is its broad applicability. Research and clinical practice show that ACT can be used effectively across a wide range of psychological, behavioural, and health issues.

Clinical Populations and Conditions

ACT is empirically supported for many conditions. A 2015 meta-analysis, systematic reviews, and more recent studies show its efficacy for:

Anxiety disorders (e.g. generalized anxiety, social anxiety)
Mood disorders, like depression
Stress, worry, rumination
Obsessive-compulsive disorder (OCD) and related conditions
Chronic pain and health conditions — ACT has been adapted for pain management and health behaviour change
Substance use problems (in treatment settings)
Eating disorders and related issues (ACT is sometimes used in conjunction with other interventions)
Chronic medical conditions (e.g. diabetes self-management, bariatric surgery adherence)
Workplace or performance settings, stress, resilience (some applied ACT research)
General life difficulties (e.g. grief, relational issues, meaning/life transitions). Because ACT is not disorder-specific, it is often considered trans-diagnostic

In short: people dealing with mental health diagnoses, chronic health issues, behaviour change challenges, or simply life stress can benefit from ACT.

Who (which people) is ACT used for?

Individuals in psychotherapy. ACT is delivered in individual therapy settings by trained clinicians (clinical psychologists, counsellors, licensed therapists).
Group therapy or workshops. Many ACT protocols are adapted for group formats (e.g. ACT groups for chronic pain, ACT for depression)
Self-help / guided ACT materials. Some protocols and workbooks allow for self-guided or semi-guided practice.
Nonclinical settings. ACT approaches are used for coaches, wellness, work stress, performance, sports psychology, and organizational interventions.
Healthcare settings. In chronic illnesses or pain clinics, ACT interventions may be integrated into medical or rehabilitation contexts.
Children & adolescents. Adaptations such as ACT for youth, or developmental versions (e.g. ACT’s DNA-V model) exist.
Couples or families. Joint ACT-based programs exist, particularly where relational values and communication are focal.

Thus, ACT is broadly applicable and flexible in format.

What Are the Benefits and Limitations of ACT?

Benefits of ACT

Empirical support. A growing evidence base (meta-analyses and randomized trials) supports ACT’s efficacy across many psychological and health domains
Trans-diagnostic utility. Because it addresses fundamental processes like avoidance and fusion, it can be adapted across conditions.
Focus on values and meaning. Many clients respond well to the emphasis on values-driven life (rather than just symptom reduction).
Flexibility. Therapists can customize metaphors, exercises, and applications.
Resilience-building. It helps clients live with discomfort, which can increase psychological resilience over time.
Integration with other therapies. ACT techniques can complement other treatments.

Limitations & Critiques

Measurement challenges. Some critics note difficulty in precisely measuring the six processes and distinguishing them empirically
Not “quick fix.” Like most therapies, change happens over time, and clients must practice outside sessions.
Therapist training is critical. Fidelity to ACT processes and skill in metaphors/exercises matter.
Variable effect sizes. For some conditions, ACT’s effects are moderate rather than large, and it may not outperform other evidence-based treatments in all contexts
Not a cure-all. In some cases, clients may need adjunctive treatments (e.g. medications, other therapies).

What Can You Expect in an ACT Therapy Session?

Typically, early sessions focus on rapport, assessment, and values clarification.
Clinicians may teach exercises in mindfulness, acceptance, defusion, perspective taking, and then gradually integrate these with committed action plans
Clients are often assigned “homework” or between-session tasks, such as short mindfulness exercises, noticing thoughts, value-clarification worksheets, or small behavioural steps.
Sessions often involve metaphors, experiential exercises, and debriefing.
Progress is monitored not just in symptom reduction but in value-consistent living and increased psychological flexibility.

Final Thoughts: Is Acceptance and Commitment Therapy Right for You?

Acceptance and Commitment Therapy (ACT) offers a compassionate, evidence-based path toward living a fuller, more meaningful life. Rather than fighting against uncomfortable thoughts or emotions, ACT invites you to make space for them — recognizing that discomfort is often a natural part of being human. By learning to accept what’s outside your control and commit to what truly matters, you can begin to live with greater clarity, purpose, and flexibility.

ACT isn’t about “positive thinking” or forcing yourself to feel better; it’s about building a healthier relationship with your inner experiences so they no longer dictate your choices. Through mindfulness, acceptance, and value-guided action, ACT helps you move from avoidance and self-criticism toward curiosity, compassion, and meaningful change. Many people find that this shift not only reduces symptoms of anxiety, depression, or stress but also enhances their overall sense of vitality and authenticity.

If you’ve felt stuck — caught in cycles of worry, avoidance, perfectionism, or emotional struggle — ACT might offer a refreshing new perspective. Working with a therapist trained in Acceptance and Commitment Therapy can help you learn practical tools for defusion, mindfulness, and committed action, all tailored to your personal values and goals.

At The Therapy Space, our therapists integrate ACT principles into treatment for a wide range of issues including anxiety, depression, trauma, and life transitions. We focus on helping you reconnect with your values, develop self-compassion, and create lasting, meaningful change — even when life feels uncertain or painful.

If you’re curious about whether ACT might be right for you, consider booking a consultation to explore how this approach could support your growth. Therapy doesn’t have to mean fighting your thoughts — it can mean learning how to live alongside them, with courage and purpose.

Start where you are. Accept what is. Commit to what matters most.

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Acceptance and Commitment Therapy (ACT)

Table of contents

What Is Acceptance and Commitment Therapy (ACT)?

How Does ACT Work?

Theoretical Foundations

Mechanisms of Change

A Simple Illustration

What Are the 6 Steps (Processes) of ACT?

Who or What Is ACT Used For?

Clinical Populations and Conditions

Who (which people) is ACT used for?

What Are the Benefits and Limitations of ACT?

Benefits of ACT

Limitations & Critiques

What Can You Expect in an ACT Therapy Session?

Final Thoughts: Is Acceptance and Commitment Therapy Right for You?

Find a therapist

Related articles

How Does Attachment-Focused Therapy Work?

What Is Person-Centered Therapy?

What Is EMDR Therapy?

What Is Compassion-Focused Therapy (CFT) — Healing Shame, Self-Criticism & Trauma

What Is Internal Family Systems (IFS) Therapy — Healing Trauma, Parts & Inner Conflict

What Are Somatic Interventions in Therapy? Healing the Mind by Listening to the Body

What Is Cognitive Processing Therapy (CPT)? How Changing Core Beliefs Can Change Your Life

What Is Relational Therapy? Healing Through Connection, Not Just Inside Your Head

What Is Strengths-Based Therapy? Focusing on What’s Right With You

What Is Adlerian Therapy?

How Does Art Therapy Work?

What Is Cognitive Behavioural Therapy and How Does It Work?

What Does Culturally Responsive Therapy Look Like?

What is Dialectical Behaviour Therapy (DBT) and How Does DBT Work?

What Is Emotion-Focused Therapy and How Does It Work?

What Is Existential Therapy?

What Is Trauma-Informed Therapy and How Does It Work?

What Is Schema Therapy and How Does It Work?

How Does Solution Focused Therapy Work and What Exactly Is It?

What Is Narrative Therapy?

What Is Trauma-Focused Cognitive Behavioural Therapy (TF-CBT) and How Does It Work?

What Is Psychodynamic Therapy and How Does It Work?

What Is Humanistic Therapy and How Does It Work?

What Is Integrative Therapy and How Does It Work?

What Is Mindfulness-Based Therapy and How Does It Work?

What Are Some Mindfulness Interventions Used in Therapy?

Spirituality in Therapy: Exploring Meaning, Connection, and Healing

What Is Gestalt Therapy and How Does It Work?

What Is Expressive Arts Therapy and How Does It Help?

What Is Behaviour Therapy and How Does It Work?

What Is Experiential Therapy and How Does It Work?

What Is Gottman Method Couples Therapy and How Does It Work?

What Is Psychoanalytic Therapy and How Does It Work?

What Is Motivational Interviewing and How Does It Work?

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