Trauma-Informed Stabilization Treatment (TIST): A Parts Approach to Therapy

If you have been living with trauma that does not respond to talk therapy, you may already suspect that something is happening in you that words alone cannot reach. The way your body goes cold when you get close to someone. The sudden floor-dropping sensation when a partner's tone changes. The part of you that has always wanted to burn the whole thing down, and the part of you that has always tried to keep everyone happy, and the exhaustion of living with both of them inside the same body.

There is a therapy model built specifically for this experience. It is called Trauma-Informed Stabilization Treatment, or TIST. It was developed by Dr. Janina Fisher, a senior clinical consultant and the author of Transforming the Living Legacy of Trauma. TIST is what I practise, and it is what I help train other therapists in. This post is about what it is, who it is for, and how it actually works.

I am a Vancouver-based psychotherapist working online across Canada. I am also a Senior Facilitator of TIST chosen by Dr. Fisher to help train and certify practitioners at the Level 3 certification stage through the Academy of Therapy Wisdom. What follows is shaped by that work.

What TIST is

TIST is a parts-informed trauma model that integrates techniques from Sensorimotor Psychotherapy, Internal Family Systems, clinical hypnosis, and cognitive restructuring. It sits within a broader tradition of embodied parts work, where parts are met through sensation and body awareness, not only through talk. In Dr. Fisher's own words on her TIST page, the model is designed for clients who "suffer from emotional flooding, shame, dissociation, and extreme inner conflict," including clients who have not responded well to other trauma approaches.

The central idea is that the symptoms most often pathologised in trauma survivors, including suicidality, self-harm, addiction, and sudden floods of rage or shame, are not random failures of coping. They are communications from parts of the personality that learned to survive a specific threat at a specific age, and have not yet been told the threat is over.

The parts, named by nervous-system response

What distinguishes TIST from Internal Family Systems, which many people encounter first, is where the parts come from. In TIST, the parts are organised around the body's survival responses: fight, flight, freeze, cry for help, and submit. These are the five animal defence responses that a human body can mount when threatened. In a child whose caregivers are themselves the source of threat, these defences get recruited into long-term survival structures. Each one becomes a part of the personality with its own job.

The fight part protects through anger and mistrust. The flight part keeps you moving so nothing catches up. The freeze part disappears into stillness. The cry-for-help part reaches for attachment, sometimes in ways that hurt you. The submit part collapses into compliance or depression. Alongside these, there is what Dr. Fisher calls the Going On with Normal Life self, the part of you that got you to adulthood, kept the job, raised the kids, showed up for the appointments.

This mapping matters because it locates your symptoms in your nervous system rather than in a character flaw. The racing heart, the sudden shutdown, the impulse to leave, the collapse into shame, these are your nervous system doing what it learned to do. Naming that changes your relationship to what is happening.

How TIST differs from IFS

IFS and TIST share a lot. Both are parts approaches. Both use what IFS calls the C-qualities of Self energy, including curiosity, compassion, connection, clarity, calm, confidence, courage, and creativity, as the stance from which healing work happens. Both teach unblending, the practice of noticing a part as a part of you rather than as all of you.

TIST differs in three specific ways. Dr. Fisher, who has trained in both, describes it this way: TIST focuses less on the traumatic memories held by parts and more on traumatic attachment and reparative experiences. It integrates somatic and hypnotic techniques alongside the parts work. And it can be used for stabilisation with clients who cannot yet safely do memory processing, which means it reaches clients who have been told they are untreatable or too dysregulated for trauma therapy.

In practice, what that means is this: when I work with you in a TIST session, we are paying close attention to what your nervous system is doing in the present moment, and we are helping you build an internal relationship between your Going On with Normal Life self and the parts that are still carrying what happened. We are not hunting for traumatic memories to process. We are offering the parts something they have never had, which is presence, curiosity, and compassion from someone inside you.

I recently spoke with Dr. Fisher and my colleague Tiff Kopp, RCC, on her podcast about exactly this work. A short clip is below.

[Embed YouTube video: https://www.youtube.com/watch?v=wmtVHFafbps]

Who TIST is for, as a client

You might be a good fit for TIST if some or all of the following feel true.

You have tried therapy and it has not quite worked. Either you got coping skills that did not reach the deeper thing, or the work flooded you and made you worse, or you bounced between therapists who did not know what to do with your specific presentation.

You have been given one or more of these diagnoses: complex PTSD, borderline personality disorder, dissociative identity disorder, dissociative disorder not otherwise specified, or a personality disorder. You do not have to agree with the label for TIST to be useful. The model is designed precisely for the experiences that get gathered under these labels.

You live with fragmentation. You know what it is like to be a different person at work than you are at home, or to look back at something you said and not know which part of you said it, or to feel like you are watching yourself from a few feet away.

You have symptoms that scare you or the people around you, including self-harm, suicidality, eating struggles, or substance use that feels bigger than willpower. TIST was originally developed for clients in locked psychiatric units and is uniquely suited to working with parts that drive these experiences, not as behaviour problems, but as trauma responses.

Who TIST is for, as a therapist

If you are a clinician reading this, TIST may be for you if you work with clients who carry complex trauma and you have felt the limits of talk therapy, cognitive-behavioural approaches, or even EMDR when someone is too fragmented or too unstable for memory processing. The TIST training pathway runs through three levels offered by the Academy of Therapy Wisdom, with Level 3 conferring the Certified TIST Practitioner designation. Certification comes through small-group practice sessions led by Senior Facilitators, one of whom is me.

I also offer ongoing consultation to therapists in Canada who are integrating TIST into their work, whether they are newly trained or deepening their fluency. This sits inside the broader trauma-informed parts therapy offerings at our practice, which also include Sensorimotor Psychotherapy consultation. If you want to talk through your client work or your next training step, reach out.

What TIST actually changes, over time

With TIST, clients do not usually describe themselves as cured. They describe themselves as less alone inside their own body. The parts that were driving the distress become recognisable, then understandable, then something closer to companions. The Going On with Normal Life self becomes steadier because it is no longer fighting its own parts for control.

This is slow work. It is also durable work. Because TIST is built on the principles of traumatic attachment and reparative experience rather than memory processing, the changes tend to hold. You are not re-living what happened. You are building something that was missing, which is an internal relationship with yourself that is steady enough to meet the parts of you that still need meeting.

If what you have read here is resonating, the next step is a consult. For clients, that is a conversation about whether this approach fits what you are carrying. For therapists, it is a conversation about your practice, your training path, and what consultation might offer you. My companion post on parts work that begins in the body may also be useful if you want a gentler introduction to how parts show up in the body.

You are not too much. The parts of you that feel like too much are trying to tell you something. In TIST, we learn their language.