How to Run Motivational Interviewing in Groups

Motivational interviewing in groups is MI delivered to several clients at once, with one or two facilitators evoking change talk from individual members and then using it to move the room. Wagner and Ingersoll set the format out as four phases: engaging the group, exploring perspectives, broadening perspectives, and moving into action. The spirit and the skills are unchanged. What changes is the arithmetic, because a facilitator cannot reflect every utterance, so the reflection-per-turn rhythm that carries individual MI has to be replaced by reflections that gather several members at once.

What actually changes when MI moves into a group

Three things, and they compound.

The arithmetic of attention. In a one-to-one session, every practitioner utterance is aimed at the one person who is speaking. That is why the reflection-to-question ratio in MITI coding means what it means. Put ten people in a room for an hour and each member has a few minutes of airtime. A facilitator who responds to every contribution with a well-built complex reflection is running a series of very short individual sessions while nine people watch.

Change talk stops being the facilitator’s job alone. This is the reason to run MI in a group at all. When a member says out loud that the mornings are getting harder, the person sitting opposite hears it from a peer rather than from a clinician, and peer statements carry a weight that no reflection from the front of the room can match. The facilitator’s job shifts from generating change talk to noticing it, marking it, and making sure the rest of the room heard it.

Sustain talk stops being contained. In a one-to-one session, sustain talk sits between two people and a reflection can soften it. In a group it is social. A member voices it, someone agrees, the agreement rewards it, and within two exchanges the room has a shared position about whether change is realistic. Nothing in individual MI prepares a practitioner for how fast that happens.

The four phases of group MI

Wagner and Ingersoll set these out in Motivational Interviewing in Groups (Guilford Press, 2012). They sit alongside the four processes rather than replacing them: EFEP still describes what is happening for each individual member, while the phases describe what is happening to the group.

Phase	What the facilitator is doing
Engaging the group	Building the alliance between members, not only between each member and the facilitator
Exploring perspectives	Getting each member’s own situation and ambivalence into the room
Broadening perspectives	Letting members hear how others see the same dilemma, which widens each person’s view of their own
Moving into action	Consolidating commitment and getting to specifics

The third phase is the one that has no individual equivalent, and it is where group MI earns its place. A member arrives with one account of their situation. They leave having heard four other accounts of something close enough to recognise, and their own has loosened. You cannot produce that effect on your own, however good your reflections are.

What replaces reflecting every member?

The linking reflection. It names what two or more members share, and it hands the floor back to the room rather than to one person.

Here is a moment from an addiction service group, early in a session:

Marcus: “I’ve done detox three times. Every time I come out and within a month I’m back where I started. So what’s the point of another programme?”

Dee: “Yeah. Same. You do the work and then it just goes.”

A well-trained individual practitioner will reach for this:

Facilitator: “You’ve put the effort in three times and it hasn’t held, and that’s left you wondering whether it’s worth trying again.”

That is a good complex reflection. In an office it would be the right response. In a group it does two unhelpful things. It hands the floor straight back to Marcus, so Dee’s agreement sits in the room unanswered. And it reflects sustain talk to eight people who were listening, which strengthens it for all of them rather than one.

Now the linking version:

Facilitator: “So between the two of you that’s a lot of goes at this. And what you’ve both said isn’t that you can’t stop, because you both have, more than once. It’s that stopping hasn’t stayed stopped. What’s been different about the times that lasted longest?”

Three things changed. It names what Marcus and Dee have in common, so neither of them owns the problem alone. It separates the ability from the maintenance, and the ability half is change talk that both of them just supplied without noticing. And it ends with a question addressed to nobody in particular, which is how you get a third member to speak.

The rule of thumb: in a group, reflect across rather than down. Down means going deeper with the person who just spoke. Across means finding the second person the statement also describes.

Why sustain talk spreads, and what to do when it does

The righting reflex is more tempting in a group than anywhere else, because the facilitator feels responsible for the mood of the room and can see it turning. Arguing the case for change to eight people who have just agreed with each other is the fastest way to lose all of them at once.

Three moves that work better:

Reflect briefly and move across. A long, careful reflection of a sustain-talk statement holds the room’s attention on it. A short one acknowledges the speaker and lets you widen.
Ask the room for the other side instead of supplying it. “That’s a real risk, and I’m not going to talk you out of it. Has anyone here had it go differently?” The answer then comes from a peer, which is the entire reason for running the group.
Mark the member who broke the pattern. When someone offers a counter-example, an affirmation does double duty: it reinforces that member and it tells the room which kind of contribution is welcome here.

What none of this means is that sustain talk should be suppressed. Ambivalence is still the normal state and a group where nobody voices the other side is a group performing agreement. The job is to keep it as one member’s honest position rather than letting it become the room’s shared conclusion.

What the evidence supports

Less than for individual MI, and it is worth being straight about that.

The strongest single test is a randomised controlled trial of group MI for veterans entering outpatient substance use treatment, published in Drug and Alcohol Dependence in 2021. It randomised 118 veterans to four sessions of manualised group MI or to a four-session psychoeducational group of equivalent length that included cognitive behavioural skills, relapse prevention and twelve-step facilitation. That is a demanding comparison, not a waiting list. Group MI came out ahead on binge drinking at one and three months, and at three months on drinking days, substance use treatment sessions attended, and twelve-step sessions attended.

Outside addiction work the literature thins quickly. Centis and colleagues reported reductions in calorie intake, sedentary time and weight at six-month follow-up from a group MI programme for obesity in 2020. Velasquez and colleagues published one of the first accounts of the adaptation in 2006, and their framing has held up: MI transfers to a group format with critical modifications, and the modifications are the part that has to be taught.

So the position to take with a service that asks is this. There is good reason to think group MI works and at least one trial where it beat an active comparison. There is not yet the depth of evidence that sits behind individual MI, and anyone who tells you otherwise has not read it.

How do you tell whether a facilitator is doing it well?

This is where trainers run into a genuine gap. MITI 4 codes a twenty-minute segment of one practitioner working with one client. Point it at a group recording and it will still count the facilitator’s open questions, reflections and adherent behaviours, but the derived ratios stop meaning what they mean elsewhere. A facilitator whose reflection-to-question ratio looks weak may be running the group well, because a large share of good group facilitation is handing the floor between members rather than responding to them.

Until there is a standard instrument for group work, the things worth watching are the ones MITI was never built to score:

Where did the change talk come from? Count member-to-member. A session where every piece of change talk was evoked by the facilitator has not used the group.
What happened after the first sustain-talk statement? Contained, or amplified into a shared position.
Did the facilitator link? Reflections that name two or more members, versus reflections aimed at one.
Airtime distribution. One member who spoke for twenty minutes usually means three who said nothing.

Those four sit outside the standard MI competence assessment tools, so a service running group MI needs to add them to its own observation form rather than assume a MITI score covers it.

How facilitators build the skill

The group-specific moves need a group. Linking, floor management and reading a room are not things you can rehearse alone, which is why co-facilitation and observed practice remain the way facilitators learn them.

What does transfer from solo practice is everything underneath. The linking reflection above is a complex reflection with a wider target, and a facilitator who cannot build one under no time pressure will not build one with eight people waiting. Softening sustain talk in a room is the same skill as softening it across a desk, applied faster.

The MI Practice Lab gives you those reps one-to-one: voice sessions with a realistic client, OARS-tagged playback, and a reading on your reflection-to-question ratio and complex reflection percentage. It does not simulate a group and it is not meant to. It keeps the underlying skills sharp between the sessions where you use them on eight people at once, which is the same argument as the one for practising MI generally.

Frequently Asked Questions

Does motivational interviewing work in groups?

The evidence is promising but thinner than for individual MI. The strongest test is a 2021 randomised controlled trial in Drug and Alcohol Dependence. It randomised 118 veterans entering outpatient substance use treatment to four sessions of group MI or to a four-session psychoeducational group containing cognitive behavioural skills, relapse prevention and twelve-step facilitation. Group MI produced lower binge drinking at one and three months, and better treatment and twelve-step attendance at three months.

What are the four phases of group motivational interviewing?

Wagner and Ingersoll describe four phases in Motivational Interviewing in Groups (Guilford Press, 2012): engaging the group, exploring perspectives, broadening perspectives, and moving into action. They describe what is happening to the group as a whole, and they sit alongside the four processes of individual MI rather than replacing them.

How is group MI different from one-to-one MI?

The spirit and the skills are the same; the mechanics are not. A facilitator cannot reflect every contribution, so linking reflections that name what two or more members share replace the reflection-per-turn rhythm. Change talk arrives from peers as well as from the facilitator, which is the main advantage. Sustain talk spreads between members, which is the main risk.

Why does sustain talk spread in a group?

Because it is social. One member voices doubt, another agrees, the agreement rewards the first statement, and within a couple of exchanges the room holds a shared position about whether change is realistic. In a one-to-one session sustain talk stays between two people and a reflection can soften it. In a group the facilitator is managing a norm rather than a statement.

Can you use MITI to code a group MI session?

You can run it, but read the output carefully. MITI 4 was designed to code a twenty-minute segment of one practitioner with one client, so on a group recording it counts the facilitator’s behaviours and ignores the group process. A facilitator with a weak reflection-to-question ratio may be facilitating well, because much of the work is passing the floor between members. Add separate observations for member-to-member change talk, sustain talk containment and linking.

Where does group MI come from?

Velasquez and colleagues published one of the first accounts of adapting MI to a group format in 2006, in the Journal of Groups in Addiction and Recovery. Wagner and Ingersoll’s book Motivational Interviewing in Groups followed from Guilford Press in 2012 and set out the four-phase structure that most group MI protocols now use.

Want to keep the underlying skills sharp between groups? The MI Practice Lab gives you one-to-one voice reps with OARS-tagged playback, your reflection-to-question ratio and your complex reflection percentage, so the reflection you need in front of eight people is already built. Start a free trial: 5 minutes, no card required.