What is Internal Family Systems?

Internal Family Systems (IFS) is a model developed by Richard Schwartz that describes the mind as a system of “parts” — distinct sub-personalities, each with its own feelings, beliefs, and job. There might be a part that pushes you to work constantly, a part that shuts down under criticism, a part that people-pleases to avoid conflict, and a part carrying old pain none of the others want to feel.

IFS assumes none of these parts are the “real problem.” Each one developed for a reason, usually to protect against something painful. The work is not to get rid of parts, but to understand what they’re protecting and help the whole internal system find more balance.

Three ideas that hold the model together

Parts are not pathology

The part that overworks, avoids, or numbs out is not treated as a flaw to eliminate. It is understood as a strategy that made sense at some point, usually a protective one.

Exiles carry the pain

IFS describes “exiles” as parts holding old hurt, shame, or fear — often kept out of awareness by protective parts working hard to keep them contained.

Self can lead

Underneath the parts, IFS proposes a core “Self” — calm, curious, and compassionate — capable of relating to every part without being taken over by any one of them.

What a session actually looks like

An IFS session often starts by identifying which part is most active right now — the anxious part, the shutdown part, the part that’s furious at a partner. Rather than talking only about that part, the therapist helps the client turn toward it with curiosity: what does it feel, what is it afraid would happen if it stopped doing its job, how old does it feel.

Over time, this shifts the relationship a client has with their own reactions. Instead of being flooded by an anxious part, a client learns to notice “a part of me is anxious” — a small but significant difference that creates room to respond rather than simply react.

What the research shows

IFS is a newer model than CBT or psychodynamic therapy, so its evidence base is smaller. A 2021 pilot effectiveness study, published in the Journal of Aggression, Maltreatment & Trauma, followed 17 adults with PTSD and histories of multiple childhood trauma through 16 sessions of IFS. It was an uncontrolled trial — there was no comparison group — but it found statistically significant reductions in PTSD symptoms, dissociation, and depression from before treatment to a one-month follow-up.¹ Larger, controlled trials are still needed, and it is honest to say the evidence for IFS is still developing rather than extensive.

Who tends to benefit most

Internal conflict and self-criticism

A harsh inner critic, a part that sabotages good things, or a persistent sense of being “at war” with yourself often responds well to IFS’s non-pathologising language.

Trauma held behind protective coping

Clients who feel numb, avoidant, or “fine on the surface” but sense something more underneath often find IFS a gentle way to approach it.

Where this approach is not the best fit

IFS is not the fastest route to a narrow, well-defined problem like a specific phobia, where structured approaches such as CBT tend to work more directly. Because the evidence base is still relatively young, it is also worth approaching claims about IFS — including on this page — with appropriate caution rather than as settled fact.

Source: Hodgdon, H. B., Anderson, F. G., Southwell, E., Hrubec, W., & Schwartz, R. (2021). Internal Family Systems (IFS) Therapy for Posttraumatic Stress Disorder (PTSD) among Survivors of Multiple Childhood Trauma: A Pilot Effectiveness Study. Journal of Aggression, Maltreatment & Trauma, 31(1), 22–43.