What the research actually says.

Eight mechanisms, two phases

The product is built on eight mechanisms drawn from established therapeutic traditions. Each is mapped to the phase of the product that engages it.

See How It Works for how each phase is implemented.

What the evidence supports

Across 400+ peer-reviewed studies, multiple meta-analyses, and clinical applications across diverse modalities, writing interventions reliably produce measurable benefits. Effect sizes are small to moderate — the mechanism works, the magnitude is honest.

Outcome evidence

Conditions and moderators

• The benefit is strongest when writing involves emotional engagement, not facts alone (Pennebaker 1986).
• Structured, paced, user-controlled formats are safer and more effective than unstructured writing (SAMHSA TIP 57).
• Self-report questionnaires elicit greater disclosure than face-to-face interviews.
• Writing about trauma without safety supports can produce retraumatisation.

The session-equivalence figure, with all three qualifiers

You will see the figure 3.2 to 4.5 therapy sessions per letter in writing about narrative therapy. We use this benchmark in our framing, and we surface every qualifier:

1. It comes from informal clinical surveys, not controlled studies. Epston asked clients in his practice "how many sessions do you consider a letter worth?" The 4.5-session average comes from that. Nylund & Thomas (1994) replicated at 3.2 sessions in a Kaiser Permanente Stockton sample. Both are practitioner findings, not experimental results.
2. It describes therapist-written letters within ongoing therapeutic relationships. The letters in those samples were written by therapists who already knew their clients, summarising sessions, externalising problems, highlighting unique outcomes.
3. Transferability to AI-generated standalone letters is plausible but unproven. No direct study compares an AI-assembled letter built from a structured self-assessment with a therapist-written letter or self-written letter. The mechanisms are well-established; the specific pipeline is not yet empirically tested.

We use this figure as an anchor for thinking about value, never as a direct equivalence claim.

Sources: Freeman, Epston & Lobovits (1997), Playful Approaches to Serious Problems, Norton; Nylund & Thomas (1994), "The economics of narrative," Family Therapy Networker, 18(6), 38–39.

The 200 questions: where they come from

The questionnaire is original work, but every question is grounded in established literature on childhood abuse, neglect, and dysfunctional family dynamics.

Two integrated frameworks:

• Abuse & Neglect — 69 questions spanning emotional abuse, physical abuse, sexual abuse, emotional neglect, and physical neglect. Source domains include the CTQ-SF construct map (Pearson; we did not adopt it), the ACE study domains (Felitti & Anda 1998; public domain), and the broader trauma literature.
• Dysfunctional Dynamics — 131 questions covering parentification, enmeshment, invalidation, role reversal, golden child / scapegoat patterns, chronic emotional unavailability, conditional regard, and other relational dysfunction patterns.

Why we wrote our own. Existing instruments — ACE (10 binary questions), CTQ-SF (28 frequency questions across 5 categories), PHQ-9 (9 current-mood questions), PCL-5 (20 current-symptom questions) — were designed to screen, classify, or measure current symptoms. None was designed to produce material that can be assembled into a personalised letter. The gap is architectural: screening compresses experiences into categories and severity scores; letter generation requires the reverse — expanding categories back into specific, attributed, personally-noted experiences.

Each question carries:

• A first-person description of the experience.
• An attribution of source framework (which tradition the construct came from).
• A row hash for change detection across questionnaire versions.

See How It Works for what you do with each question during the assessment.

The screening instruments

Two original screeners run before the main assessment. Both are described in detail under How It Works → Before the assessment. Their academic basis is here.

SRS-8 (Safety Risk Screener)

A structured screener for suicidal ideation and self-harm risk, designed for unsupervised digital self-administration. Adaptive branching keeps the experience brief for low-risk respondents (2 questions) and progressively deepens inquiry only where disclosure warrants it. Embedded micro-interventions (protective-factor articulation, help-seeking readiness) function as brief therapeutic contact points within the screening itself.

The C-SSRS (Columbia) is the institutional gold standard for clinician-administered suicide screening. It is purpose-built for trained clinicians in care settings. The SRS-8 is built for the gap C-SSRS does not fill: scenarios where no clinician is present and no clinical infrastructure exists.

PWA-9 (Personal Wellbeing Assessment)

A nine-question self-report measure of current wellbeing across seven dimensions (emotional stability, cognitive clarity, energy, social connection, agency, sleep quality, engagement) plus two standalone signals: perceived trajectory (PGIC-style) and distress tolerance.

The WHO-5 (CC BY-NC-SA 3.0 IGO) is the unidimensional benchmark for brief wellbeing screening. PWA-9 is dimensional rather than composite — a person scoring low can immediately see which dimensions are compromised, without requiring a second instrument.

Status

Both are face-valid and constructed on established psychometric principles. Neither has been empirically validated in a peer-reviewed study. Both are designed as triage gates, not standalone interventions; neither is a substitute for professional clinical care.

What the evidence does not support

We are explicit about the gaps so we are not later accused of overclaiming.

1. "This product heals childhood trauma." No single intervention heals trauma. The evidence supports moderate, not transformative, effects from writing interventions.
2. "AI-generated letters are as effective as therapist-written or self-written letters." No direct evidence exists. The hypothesis is theoretically grounded but empirically untested.
3. "This replaces therapy." Writing interventions are complements to professional therapeutic work, not replacements. The product's standalone value is real (structured self-discovery, tangible output, time compression), but should not be conflated with therapy equivalence.
4. "Your letter is worth X therapy sessions." The 3.2–4.5 session figure comes from a specific context (narrative therapy letters written by therapists within ongoing relationships). We use it as a value anchor, not as a direct equivalence claim for our output.

Full citations

Active processing — Pennebaker paradigm

• Pennebaker, J. W., & Beall, S. K. (1986). Confronting a traumatic event: Toward an understanding of inhibition and disease. Journal of Abnormal Psychology, 95(3), 274–281.
• Pennebaker, J. W., Kiecolt-Glaser, J. K., & Glaser, R. (1988). Disclosure of traumas and immune function: Health implications for psychotherapy. Journal of Consulting and Clinical Psychology, 56(2), 239–245.
• Pennebaker, J. W. (2018). Expressive writing in psychological science. Perspectives on Psychological Science, 13(2), 226–229.
• Pennebaker, J. W. (2016). Opening up by writing it down: How expressive writing improves health and eases emotional pain (3rd ed.). Guilford Press.

Meta-analyses

• Smyth, J. M. (1998). Written emotional expression: Effect sizes, outcome types, and moderating variables. Journal of Consulting and Clinical Psychology, 66(1), 174–184.
• Frisina, P. G., Borod, J. C., & Lepore, S. J. (2004). A meta-analysis of the effects of written emotional disclosure on the health outcomes of clinical populations. Journal of Nervous & Mental Disease, 192(9), 629–634.
• Frattaroli, J. (2006). Experimental disclosure and its moderators: A meta-analysis. Psychological Bulletin, 132(6), 823–865.
• Pavlacic, J. M., et al. (2019). A meta-analysis of expressive writing on posttraumatic stress, posttraumatic growth, and quality of life. Review of General Psychology, 23(2), 230–250.
• Sohal, M., Singh, P., Dhillon, B. S., & Gill, H. S. (2022). Efficacy of journaling in the management of mental illness: A systematic review and meta-analysis. Family Medicine and Community Health, 10(1), e001154.
• Kirca, A., Malouff, J. M., & Meynadier, J. (2023). The effect of expressing gratitude on subjective well-being: A meta-analysis. International Journal of Applied Positive Psychology, 8, 347–373.

Mirror function — Narrative therapy letters

• White, M., & Epston, D. (1990). Narrative means to therapeutic ends. Norton.
• Freeman, J., Epston, D., & Lobovits, D. (1997). Playful approaches to serious problems: Narrative therapy with children and their families. Norton.
• Nylund, D., & Thomas, J. (1994). The economics of narrative. Family Therapy Networker, 18(6), 38–39.
• Bjoroy, A., Madigan, S., & Nylund, D. (2015). The practice of therapeutic letter writing in narrative therapy. In The handbook of counselling psychology (4th ed., pp. 332–348). Sage.

Structured exposure — CPT and trauma writing

• Resick, P. A., & Schnicke, M. K. (1992). Cognitive processing therapy for sexual assault victims. Journal of Consulting and Clinical Psychology, 60(5), 748–756.
• Resick, P. A., et al. (2012). A randomized clinical trial of CPT-C, CPT, and written accounts. Journal of Consulting and Clinical Psychology, 80(2), 201–210.
• Substance Abuse and Mental Health Services Administration (SAMHSA). TIP 57: Trauma-Informed Care in Behavioral Health Services.

Recognition & validation — ACE and disclosure

• Felitti, V. J., Anda, R. F., et al. (1998). Relationship of childhood abuse and household dysfunction to many of the leading causes of death in adults: The Adverse Childhood Experiences (ACE) study. American Journal of Preventive Medicine, 14(4), 245–258.

Closure — Confrontation letters

• Forward, S. (1989). Toxic parents: Overcoming their hurtful legacy and reclaiming your life. Bantam.

Self-compassion

• Neff, K. D., & Germer, C. K. (2013). A pilot study and randomized controlled trial of the mindful self-compassion program. Journal of Clinical Psychology, 69(1), 28–44.
• Neff, K. D. (2023). Self-compassion: Theory, method, research, and intervention. Annual Review of Psychology, 74, 193–218.

Narrative reauthoring (additional)

• "Dear John: Letter writing as narrative therapy intervention" (2024). Trends in Psychology, Springer.

Related practitioner frameworks

• Walker, P. (2013). Complex PTSD: From surviving to thriving. Azure Coyote.
• Bradshaw, J. (1990). Homecoming: Reclaiming and championing your inner child. Bantam.
• Young, J. E., Klosko, J. S., & Weishaar, M. E. (2003). Schema therapy: A practitioner's guide. Guilford.
• Prasko, J., et al. (2012). Therapeutic letters and emotional schemas. Activitas Nervosa Superior Rediviva.
• Paivio, S. C., & Greenberg, L. S. (1995). Resolving "unfinished business": Efficacy of experiential therapy using empty-chair dialogue. Journal of Consulting and Clinical Psychology, 63(3), 419–425.
• Wade, N. G., et al. (2014). Efficacy of psychotherapeutic interventions to promote forgiveness: A meta-analysis. Journal of Consulting and Clinical Psychology, 82(1), 154–170.
• Seligman, M. E. P., et al. (2005). Positive psychology progress: Empirical validation of interventions. American Psychologist, 60(5), 410–421.