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Family Constellations vs. Internal Family Systems: How They Differ, and What the Evidence Shows

family constellations vs internal family systems

Family constellations is a group process from Bert Hellinger’s work that explores family patterns across generations. Internal Family Systems (IFS) is a psychotherapy model that works with the parts of a person’s inner system. Here is how they overlap, how they differ, and what the research shows.

Family constellations is a group process, developed from the work of Bert Hellinger, that looks at family patterns across generations. Internal Family Systems (IFS) is a psychotherapy model that works with the parts of a person's inner system. The short difference: family constellations is oriented to the family system, and IFS is oriented to the internal one.

Where family constellations comes from

The most direct account in the sources we checked is Dan Booth Cohen's 2006 introduction in The Family Journal, which includes a short biography of Hellinger, born in 1925. Cohen describes family constellations as a transgenerational, phenomenological therapeutic intervention. He places its roots in family systems therapy, in existential phenomenology, and in the ancestor reverence of the Zulu people of South Africa.

Cohen also reports that family therapy associations in Europe sanctioned the process and that many licensed practitioners worldwide were taking it up, while the work was still virtually unknown in the United States. That is one practitioner-writer's account of the method's history. We did not check it against independent histories, and the research reviews discussed below do not settle the question of origins.

Where Internal Family Systems comes from

IFS is associated with Richard C. Schwartz, who co-authored the 2013 randomized proof-of-concept trial described below. In the 2025 pilot study of an online IFS group for people with posttraumatic stress and substance use, the authors describe the model as informed by insight-oriented lineages that include family systems, relational, object relations and attachment approaches.

As that pilot describes the model, no part is bad. Each part is a sub-personality with its own motivations, feelings, thoughts and perceptions, and parts are distinguished from a core consciousness that the model characterizes by qualities such as curiosity, compassion and mindfulness. The same paper uses three terms for parts that IFS work commonly deals with: managers, which keep life under control through restraint or rumination; firefighters, which act to reduce emotional pain quickly, often through disinhibited behavior; and exiles, described as vulnerable self-states marked by intrusive memories or intense negative emotion.

Explore: internal family systems · ifs parts mapping

Where they overlap

Both draw on family systems thinking. Cohen places the roots of family constellations in family systems therapy, and the 2025 IFS pilot lists family systems among the lineages informing IFS. In each case the sources describe the person in relation to a larger system: a family in one, a set of inner parts in the other. This shared root is the sources' own account; we did not verify how the two developed historically.

They overlap in format too. Family constellations is a group process. The 2025 IFS pilot delivered its model in twelve weekly groups alongside six individual counseling sessions, so IFS has also been run with other people in the room.

Where they genuinely differ

The first difference is what each one works on. Family constellations, as Cohen describes it, is transgenerational and works with the family system across generations. IFS works with the parts of one person's inner system and that person's relationship to those parts from core consciousness. The second difference is structure. IFS is a named psychotherapy model with a defined vocabulary of parts, and the studies of it describe individual and group formats. The sources we checked describe family constellations as a group process but do not lay out its sequence of steps in enough detail for us to set that sequence out here.

The third difference is the evidence base, which is the part most worth checking for yourself. IFS has a small number of randomized and pilot studies, covered below. Family constellations has several published reviews and trials, and their conclusions disagree. The table summarizes the contrast.

Family constellations and Internal Family Systems side by side
Family constellationsInternal Family Systems
OriginBert Hellinger's group process; Cohen (2006) places roots in family systems therapy, existential phenomenology and ancestor reverence in Zulu traditionA model associated with Richard C. Schwartz; its 2025 pilot lists family systems among its lineages
Main focusFamily patterns across generationsThe parts of one person's inner system and that person's relationship to their core consciousness
FormatA group processA psychotherapy model used in individual sessions and in groups
Evidence baseA 2021 systematic review that found benefit in most studies while noting methodological limits; a 2024 randomized trial with small gains that mostly faded by six months; a 2026 preprint review that finds no reliable evidenceA 2013 randomized proof-of-concept trial with some sustained gains; a 2021 pilot effectiveness study for PTSD; a 2025 single-arm pilot in ten adults

Each row is supported by the research entries listed below.

Explore: internal family systems

What the evidence actually says

For family constellations, a 2021 systematic review by Konkolÿ Thege and colleagues in Family Process is the one we checked most closely. It covered 12 prospective studies with 568 participants, searched through April 2020. Nine of the 12 showed significant improvement after the intervention. The authors note that the studies showing no benefit were of lower methodological quality, and they describe the overall quality and quantity of the evidence as low. A random-effects meta-analysis of five studies on general psychopathology found a moderate effect, a Hedges g of about 0.53.

A 2024 randomized trial by Konkolÿ Thege and Szabó in the Journal of Psychiatric Research tested a pandemic-adjusted, single-day version in 80 people from the general population. Participants improved significantly on the primary outcome at one and six months. The authors describe the gains as small and mostly gone by six months, found no significant difference between the groups over time, and note protocol deviations caused by the pandemic that limit how far the results generalize.

A 2026 systematic review and meta-analysis, posted as a medRxiv preprint by Souza, Souza and de Alcântara Mendes, reaches a more negative conclusion. It reports no reliable evidence supporting family constellation therapy for any condition, judges all included trials to be at high risk of bias, and notes concerns about adverse effects. We did not confirm whether it has since been peer reviewed, so it should be weighed as a preprint. The two reviews are not drawn from the same set of studies: the 2021 review covers prospective studies of varied designs, while the 2026 preprint includes only randomized trials. A reader can check both.

For IFS, the controlled study we checked most closely is Shadick and colleagues' 2013 randomized proof-of-concept trial in people with rheumatoid arthritis, published in The Journal of Rheumatology. Of 79 randomized participants, 68 completed the assessments. Improvements favoring the IFS group in overall pain and physical function were present at the end of treatment. Gains in joint pain, self-compassion and depressive symptoms held one year later; anxiety, self-efficacy and disease activity did not show sustained change. The authors call the intervention feasible and acceptable and say that future efficacy trials are warranted.

Hodgdon and colleagues' 2021 pilot effectiveness study examined IFS therapy for PTSD among adults with histories of multiple childhood traumas. Ally and colleagues' 2025 pilot tested a twelve-week online IFS-based group, with individual sessions, in ten adults with co-occurring PTSD and substance use disorder, and it was single-arm. These are small pilot studies. In the sources we checked we did not locate a large independent trial of IFS. That reflects what our searches found, not a verified absence.

Choosing between them, honestly

The tendencies below are not verdicts. Family constellations may suit someone who wants to look at family history and patterns across generations, who is comfortable in a group, and who is willing to weigh the thin evidence base as part of the decision. IFS may suit someone who wants an individual, structured model for internal conflict, such as one part pushing toward something another part resists, and who values a vocabulary for naming parts. Some people look at both. Deciding how to combine them is a question for a practitioner trained in each.

Difficult experiences can come up in either approach, and if they do, a qualified clinician is the right person to work with them. If you are having thoughts of harming yourself, contact local emergency services or a crisis line, such as 988 in the US.

How to evaluate any teacher, book, program or tool for this

A few questions hold up for either approach. Who trained the facilitator, in what, and is that training named so you can check it? Does the material say where its ideas come from, and does it separate the author's own account of history from independent evidence? Does it describe the difference between a theory, a pilot study and a randomized trial, and does it report results that disappoint as well as results that encourage? Does it say what can go wrong, including when to see a clinician? And does it leave you more able to observe your own experience, rather than more reliant on the person leading it? If a group is involved, ask how the facilitator responds when someone becomes distressed.

Where IX Coach fits

IX Coach is an AI coaching platform. It is designed to help people notice what is driving them in a given moment and to reflect on it. It is not therapy, it is not a teacher in either lineage described above. It is not a crisis service and does not detect a crisis; if what comes up feels heavy, a qualified clinician is the right person to talk to.

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