Which has stronger evidence, IFS or KAP?

IFS is rct-supported; KAP is guideline-recommended. Both have evidence for PTSD & Acute Trauma, Depression & Mood Disorders.

Which conditions can be treated by both IFS and KAP?

Both IFS and KAP are applied to 2 shared conditions: PTSD & Acute Trauma, Depression & Mood Disorders.

IFS vs KAP

Q: What's the difference between IFS and KAP?

IFS works by Self-energy (curiosity, compassion, calm) accesses and unburdenes exiled parts; protector parts relax when exiles are healed KAP, by contrast, works by Ketamine-induced neuroplasticity + dissociative state creates window for psychotherapeutic processing and new learning IFS sits within the Family Systems tradition; KAP sits within the Psychedelic tradition.

A side-by-side comparison: mechanism, evidence, the conditions each treats, philosophical roots, and where they actually disagree clinically.

At a glance

IFS

Tradition: Family Systems
Founder: Richard Schwartz (1995)
Evidence: RCT-supported
Focus: Experiential + Systemic
Format: Individual + Couples
Duration: Open-ended

KAP

Tradition: Psychedelic
Founder: Various (Wolfson, Bennett) (2010)
Evidence: Guideline-recommended
Focus: Experiential + Processing
Format: Individual
Duration: Short-medium

How they work

IFS

Core mechanism: Self-energy (curiosity, compassion, calm) accesses and unburdenes exiled parts; protector parts relax when exiles are healed

Ontology: Internal system of parts carrying burdens from attachment injuries; protectors manage exiles' pain

KAP

Core mechanism: Ketamine-induced neuroplasticity + dissociative state creates window for psychotherapeutic processing and new learning

Ontology: Treatment-resistant conditions involve rigid neural patterns; ketamine disrupts rigidity and opens plasticity window

Conditions treated

2 shared · 5 IFS-only · 2 KAP-only

Only IFS

Complex Trauma / Developmental Trauma Dissociative Disorders Personality Disorders Anxiety Disorders Attachment & Relational Patterns

Only KAP

Chronic Pain & Somatic Symptoms Substance Use & Addictions

What each assumes — and misses

IFS

Philosophical roots: Systems theory (Bertalanffy); Schwartz (inner system as family); Jung (subpersonalities, Self); Buddhist concept of witnessing awareness (Self-energy); multiplicity of mind (Ornstein, Minsky)

Blind spots: Popularity far outpaces evidence base; parts language can become reified; limited research outside pilot studies

Therapeutic voice: Can you ask that critical part what it's afraid would happen if it stepped back?

KAP

Philosophical roots: James (varieties of religious experience — altered states as data); Grof (non-ordinary states); neuroplasticity research; mystical tradition broadly

Blind spots: Regulatory fragmentation; limited standardization of psychotherapy component; risk of ketamine becoming the treatment rather than catalyst

Therapeutic voice: As the medicine takes effect, just notice what arises without directing it. We'll make sense of it together.

Choosing between them

IFS (Family Systems) and KAP (Psychedelic) come from different traditions, which means they assume different things about what a person is, what causes suffering, and what the therapeutic relationship is for. The choice between them is often less about "which works better" and more about which set of assumptions fits the client and the therapist.

For deeper coverage: see the full IFS and KAP pages, or use the interactive comparison tool to add more modalities to this comparison.