Multiple Psychotherapy

Abstract

Multiple psychotherapy is a form of psychotherapy in which more than one therapist works with the same patient or group at the same time. Coined by the Adlerian psychiatrist Rudolf Dreikurs in 1950, and more widely known today as co-therapy or coleadership, it was devised to give the therapist in-the-room supervision and to give the patient two perspectives, a diluted transference, and a living model of how two people relate. The arrangement became routine in family therapy through Carl Whitaker and Virginia Satir and in group therapy through the coleadership tradition. Its distinctive risks mirror its benefits: two therapists who quietly disagree can be split by a group or family, whereas two who disagree openly and repair the breach model healthy conflict. This article surveys its origins, advantages, relationship, settings, and uneven evidence base.

Keywords: multiple psychotherapy, co-therapy, coleadership

What Multiple Psychotherapy Is

Multiple psychotherapy is the practice of two, or occasionally more, therapists treating the same patient or the same group together, in the same room and at the same time. MeSH defines it plainly as the use of more than one therapist at one time in individual or group psychotherapy. The therapists share responsibility for the case, confer openly, and work as a coordinated pair rather than dividing the patient between them. The term originates with Rudolf Dreikurs, who set out its techniques and dynamics in 1950 and treated the second therapist not as an observer but as a full participant (Dreikurs, 1950).

The arrangement must be distinguished from two things it resembles. It is not the same as conjoint therapy, in which one therapist sees several clients, such as a couple, together: co-therapy multiplies therapists, conjoint therapy multiplies clients. Nor is it merely a training expedient in which a trainee watches; in true multiple psychotherapy both clinicians are active agents of change. In the group setting the practice is usually called coleadership, and the standard group-therapy texts treat the co-led group as a common and defensible configuration (Yalom & Leszcz, 2005).

Origins and the Adlerian Roots

The idea of a second therapist in the room predates its name. Alfred Adler is generally credited with the first informal use of what he called multiple therapy, and it was his follower Rudolf Dreikurs who gave the method its rationale and its literature. In his 1950 paper Dreikurs described a deliberate technique in which two therapists alternate and combine their roles, and analysed the transference and counter-transference dynamics that a second clinician introduces (Dreikurs, 1950). He returned to the subject in a two-part series in 1952 that separated the method’s benefits for the therapist from its benefits for the patient.

Dreikurs situated the technique within a larger argument about the future of treatment. In Group psychotherapy and the third revolution in psychiatry he cast the movement of therapy out of the private dyad, toward groups and shared responsibility, as a democratization of a field that had been individual and hierarchical (Dreikurs, 1955). The practice found its most visible home in family therapy: Carl Whitaker made co-therapy the routine mode of his symbolic-experiential work, and his account with Augustus Napier of a single family’s treatment shows two therapists working in concert throughout (Napier & Whitaker, 1978).

The Catalogued Advantages

Dreikurs’ two-part analysis remains the clearest inventory of why a second therapist might help. For the therapist, the co-therapist supplies in-the-room supervision and a second read on the case, catches the blind spots and counter-transference that a lone clinician cannot see in themselves, shares the emotional load of difficult work, and offers an unmatched training vehicle in which a novice learns beside an experienced colleague (Dreikurs, Shulman, & Mosak, 1952). For the patient, the pair dilutes an intense or eroticized transference across two figures, guarantees continuity when one therapist is absent, provides two vantage points on the same material, and, most distinctively, lets the patient watch two people cooperate, differ, and resolve differences in real time (Dreikurs, Mosak, & Shulman, 1952).

Dreikurs’ two-sided ledger of advantages

Dreikurs analysed the benefits of a second therapist separately for the clinician and for the patient. Switch sides to see each list.

• In-the-room supervision. A colleague observes the session as it happens and offers a second read the lone clinician cannot get from memory alone.
• A check on blind spots. The co-therapist can notice counter-transference and habitual errors that are invisible from inside them.
• Shared emotional load. Two clinicians divide the strain of intense or high-risk work, reducing isolation and burnout.
• A training vehicle. A novice learns by working beside an experienced therapist rather than merely watching one.

That last advantage is the one with no solo equivalent. A single therapist can describe healthy relating; co-therapists enact it. For a patient whose formative relationships were chaotic or coercive, the sight of two authorities disagreeing without rupture can itself be corrective, a point later traditions would develop into an explicit therapeutic mechanism.

The Co-Therapy Relationship

The pairing is not a mere sum of two clinicians; the relationship between them becomes an instrument that must itself be tended. Roller and Nelson, in the standard clinical treatment of the subject, describe the co-therapy relationship as something that forms, develops, and matures over time, and argue that its health, honest communication, compatibility of style, and a willingness to address friction directly, largely determines whether the pairing helps or hinders (Roller & Nelson, 1991). A mismatched or conflict-avoidant pair can transmit its unspoken tension to the very people it treats.

The empirical literature on the arrangement is thinner than its clinical prominence would suggest. Reviewing group coleadership, Luke and Hackney found a practice that is widely taught and widely used but sparsely researched, resting more on accumulated clinical wisdom than on controlled comparison, and they called for the study of what actually makes a co-leading pair effective (Luke & Hackney, 2007). The gap between how common co-therapy is and how little is known about it recurs throughout its evidence base.

Co-Therapy Across Settings

Multiple psychotherapy is deployed differently depending on the treatment format, and its rationale shifts with the setting. The table below sets out the three main homes of the practice.

In marriage and family therapy the training rationale is especially strong. Hendrix, Fournier, and Briggs examined co-therapy teams and reported that the format, whatever its cost, offers supervised clinicians a protected setting in which to develop, even as its measured effects on client outcome remained modest and hard to isolate (Hendrix, Fournier, & Briggs, 2001).

Rupture and Repair Between Co-Therapists

The signature risk of multiple psychotherapy is the dark twin of its signature benefit. Because a patient or a group is watching two authorities, disagreement between them is never invisible, and how it is handled matters. When co-therapists differ and hide it, the unspoken conflict tends to be enacted by the people they treat, who may split the pair into a good therapist and a bad one — a defensive process of splitting — and triangulate the two clinicians, playing one against the other. When co-therapists differ openly and then repair the breach, the same disagreement becomes a demonstration that conflict need not be catastrophic. Chang-Caffaro and Caffaro frame this rupture-and-repair between coleaders as a therapeutic opportunity rather than a failure, provided the leaders can name the rift and mend it in view of the group (Chang-Caffaro & Caffaro, 2021).

When coleaders differ: rupture, repair, and group climate

Two leaders need not agree on everything. What matters is whether they repair the rifts in view of the group. Set their baseline alignment and their skill at repairing disagreement, and watch the group climate shift.

Steady but unremarkable: little visible disagreement to work with either way.

The model is illustrative: its single lesson is that repair, not agreement, is what makes disagreement between co-therapists useful.

What patients themselves notice supports this emphasis. In a study of group cognitive behavioral therapy, Bryde Christensen and colleagues asked patients how they experienced the co-therapists’ behavior and found that members were attentive to the leaders’ coordination, mutual respect, and complementary roles, and that a visibly well-functioning pair contributed to their sense of safety (Bryde Christensen et al., 2022). The co-therapists’ relationship, in other words, is not a backstage matter; it is part of the treatment the patient receives.

Worked Example

A recurring objection to multiple psychotherapy is that it doubles the clinician cost. That is true in one comparison and misleading in another, and a little arithmetic separates them. Count the therapist time each format spends per patient, the resource that actually costs money.

Take an individual session of 50 minutes with one therapist: that is 1 × 50 = 50 therapist-minutes per patient. Now take a group of eight members meeting for 90 minutes. Led by one therapist, it spends 1 × 90 = 90 therapist-minutes across 8 patients, or 90 / 8 = 11.25 therapist-minutes per patient. Co-led by two therapists, the same group spends 2 × 90 = 180 therapist-minutes across 8 patients, or 180 / 8 = 22.5 therapist-minutes per patient.

The two comparisons now read cleanly. Against the solo-led group, co-therapy is exactly twice as therapist-intensive (22.5 / 11.25 = 2.0), the real premium the objection points to. Against individual therapy, however, the co-led group still spends less than half the therapist time per patient (22.5 / 50 = 0.45, a 55% reduction). Whether the premium over solo leadership is worth paying is precisely the empirical question the evidence base has struggled to answer; the point of the calculation is that co-therapy is costly relative to one group leader, yet remains efficient relative to seeing patients one at a time.

Therapist-minutes per patient

Co-therapy is often called twice as expensive. It is — but only against a solo group leader. Set the group size, session length, and number of leaders, and compare the therapist time spent per patient with a 50-minute individual session. Defaults reproduce the worked example.

The Evidence Base

The honest summary is that multiple psychotherapy is far better established in practice than in data. The clinical case, made by Dreikurs, Whitaker, and Roller and Nelson, is rich and internally coherent, but controlled trials that isolate the effect of a second therapist are scarce. Luke and Hackney’s review of coleadership is blunt on this point: the format is a staple of training and service yet has attracted little rigorous outcome research, and the claims made for it are largely clinical rather than experimental (Luke & Hackney, 2007). Where outcomes have been examined, as in Hendrix and colleagues’ study of co-therapy teams, the training benefits are more clearly demonstrable than any gain in client outcome (Hendrix, Fournier, & Briggs, 2001).

What the wider group literature does establish is the importance of the therapeutic alliance, which co-therapy is meant to strengthen. A multilevel meta-analysis by Lo Coco and colleagues confirmed a reliable association between the quality of the alliance and outcome across group interventions (Lo Coco et al., 2022). That finding is about group therapy in general rather than coleadership specifically, but it locates the mechanism, alliance and climate, through which a well-matched co-therapy pair would be expected to help, and by which a poorly matched one would be expected to harm.

Discussion

Multiple psychotherapy occupies an unusual position among treatment methods: a technique with a clear rationale, a seventy-year pedigree, and eminent advocates, yet a strikingly thin experimental base. Its logic is sound and, in places, unique, no lone therapist can enact a relationship, and the corrective sight of two people differing and repairing has no single-clinician substitute. Its costs are equally real: two clinicians for one case, the coordination overhead of a working pair, and the specific hazard that a concealed rift between the therapists is transmitted to the people they treat.

The most defensible reading is that the method’s value lives almost entirely in the quality of the co-therapy relationship. A compatible, communicative pair that treats its own disagreements as material to be worked with offers something a solo therapist cannot; an ill-matched or conflict-avoidant pair may be worse than either therapist alone. This is why the modern literature has shifted from cataloguing advantages toward studying the pair itself, its ruptures, its repairs, and what patients perceive of both.

Current Directions

Recent work has largely abandoned the question of whether co-therapy is good in the abstract in favor of examining the relationship that carries its effect. The rupture-and-repair framing of Chang-Caffaro and Caffaro reconceives coleader disagreement as a usable clinical event rather than a lapse, and gives supervisors a concrete process to teach (Chang-Caffaro & Caffaro, 2021). Complementing this clinician-side turn, patient-perspective research has begun to document what group members actually register about their co-therapists, showing that coordination and mutual respect between leaders are perceived and valued (Bryde Christensen et al., 2022).

The method is also being extended into newer service models. In the Open Dialogue approach to psychosis and crisis, where more than one clinician routinely meets a person and their network together, Lagogianni, Georgaca, and Christoforidou analysed how working as co-therapists transforms the clinicians’ own stance, shifting authority from a single expert to a shared, reflective space (Lagogianni, Georgaca, & Christoforidou, 2023). Alongside these qualitative and process studies, the group-therapy field’s consolidation of the alliance-outcome association gives future co-therapy research a measurable target: whether, and under what conditions, a second leader actually improves the alliance and climate that predict outcome (Lo Coco et al., 2022).

Common Misconceptions

Multiple psychotherapy just means group therapy.

It refers to multiple therapists, not multiple patients. Co-therapy can be used in individual treatment with a single patient; what defines it is the presence of a second clinician, not the number of clients (Dreikurs, 1950).

The second therapist is really just a trainee observer.

In true multiple psychotherapy both clinicians are active agents. Training is one of its uses, but the co-therapist participates in the work rather than watching it (Dreikurs, Shulman, & Mosak, 1952).

Co-therapists should present a united front and never disagree.

Visible, well-repaired disagreement is one of co-therapy’s distinctive benefits; it is concealed disagreement that does harm, by inviting a group or family to split the pair (Chang-Caffaro & Caffaro, 2021).

Glossary

Co-therapist compatibility.

The degree of fit in style, values, and communication between two therapists, a chief determinant of whether the pairing helps or harms.

Co-therapy.

The common modern name for multiple psychotherapy: two therapists working with the same patient or group at the same time.

Coleadership.

The group-therapy form of multiple psychotherapy, in which two leaders share responsibility for running the group.

Conjoint therapy.

Treatment in which one therapist sees several related clients together, such as a couple or family; the mirror image of co-therapy, which multiplies therapists rather than clients.

Counter-transference.

The therapist’s own emotional reactions to a patient; a second therapist can help detect and correct the blind spots it creates.

Group climate.

The prevailing emotional atmosphere of a therapy group, shaped by engagement, conflict, and avoidance, and influenced by how its leaders work together.

Multiple psychotherapy.

The use of more than one therapist at one time in individual or group psychotherapy; the MeSH descriptor and Dreikurs’ original term.

Open Dialogue.

A network-based approach to psychosis and crisis in which several clinicians meet a person and their support system together, a contemporary setting for co-therapy.

Repair.

The process of acknowledging and mending a rupture; between co-therapists, a repaired disagreement can model healthy conflict resolution for patients.

Rupture.

A tension, breakdown, or open conflict in a relationship; in co-therapy, a rift between the two therapists that patients readily perceive.

Splitting.

The tendency of a patient, group, or family to cast one co-therapist as good and the other as bad, often when the therapists’ own disagreement is concealed.

Symbolic-experiential family therapy.

Carl Whitaker’s approach to family treatment, which made co-therapy a routine feature to keep the therapists from being absorbed into the family system.

Therapeutic alliance.

The collaborative bond and shared goals between therapist and client; its quality is reliably associated with outcome, including in group interventions.

Transference.

The redirection onto the therapist of feelings rooted in a patient’s earlier relationships; co-therapy can dilute an intense transference across two figures.

Triangulation.

The drawing of a third party into a two-person conflict; a group or family may triangulate co-therapists who are quietly at odds.

Key Researchers

John V. Caffaro (living). Clinical psychologist at the California School of Professional Psychology, Alliant International University; co-author of the contemporary account of rupture and repair between group coleaders. Faculty page

Gianluca Lo Coco (living). Professor of clinical psychology at the University of Palermo and a group process-and-outcome researcher; lead author of the 2022 multilevel meta-analysis of the alliance-outcome association in group interventions. ORCID

Rudolf Dreikurs (1897-1972). Adlerian psychiatrist who coined and formalized multiple psychotherapy in his 1950 paper and its 1952 sequels, and championed group methods as a democratization of treatment. Wikipedia

Melissa Luke (living). Counselor educator at Syracuse University whose 2007 critical review of group coleadership remains the reference synthesis on the practice. ORCID

Virginia Satir (1916-1988). Founding family therapist at the Mental Research Institute in Palo Alto, credited alongside Whitaker with establishing co-therapy as routine in family work. Wikipedia

Carl A. Whitaker (1912-1995). Symbolic-experiential family therapist who made co-therapy the standard mode of his practice and documented it in The Family Crucible. Wikipedia

Frequently Asked Questions

What is multiple psychotherapy?
It is the use of more than one therapist at one time with the same patient or group, an arrangement now more often called co-therapy or coleadership. The therapists share the case and work as a coordinated pair, and the method was set out by Rudolf Dreikurs in 1950 (Dreikurs, 1950).

How is co-therapy different from group therapy?
Co-therapy multiplies therapists; group therapy multiplies patients. The two often coincide, because coleadership of a group is the most common form of co-therapy today, but co-therapy can also be used with a single patient, and a group can be led by one therapist (Yalom & Leszcz, 2005).

What are the advantages of a second therapist?
For the therapist, in-the-room supervision, a check on blind spots, shared load, and training; for the patient, a diluted transference, continuity across absences, two perspectives, and the chance to watch two people cooperate and differ constructively (Dreikurs, Mosak, & Shulman, 1952).

What happens when co-therapists disagree?
It depends entirely on whether the disagreement is repaired. Concealed conflict tends to be enacted by the patients, who may split the pair; openly acknowledged and repaired conflict models healthy conflict resolution (Chang-Caffaro & Caffaro, 2021).

Is co-therapy actually effective?
The clinical case is strong but the experimental evidence is thin. Reviews find coleadership widely practised yet sparsely researched, with training benefits clearer than demonstrated gains in client outcome (Luke & Hackney, 2007).

Who invented multiple psychotherapy?
The informal idea is credited to Alfred Adler, but Rudolf Dreikurs named the method, developed its technique, and produced its founding literature between 1950 and 1955 (Dreikurs, 1950).

Is co-therapy worth the extra cost?
It doubles the therapist time per patient relative to a single group leader, but a co-led group still uses less than half the therapist time per patient of individual therapy. Whether the premium over solo leadership buys better outcomes is the open empirical question (Hendrix, Fournier, & Briggs, 2001).

Where is co-therapy used today?
Most commonly in group therapy and in family therapy, and increasingly in network approaches such as Open Dialogue, where several clinicians meet a person and their support system together (Lagogianni, Georgaca, & Christoforidou, 2023).

References