Multisystemic therapy

1. Introduction

Version followed: standard licensed Multisystemic Therapy (MST) for youth aged about 12–17 with serious antisocial behaviour, as set out in Henggeler, Schoenwald, Borduin, Rowland & Cunningham (2009, 2nd ed., Guilford; chapter structure used, text not drawn on), the MST Supervisory Manual (Henggeler & Schoenwald, 1998), Henggeler (2012), and current programme parameters published by MST Services and US payers (Louisiana Medicaid, 2024). Components unique to the child-abuse adaptation (MST-CAN) and the substance-use components are taken from Swenson (MUSC, 2005) and are labelled as such.

MST is an intensive, home- and community-based family treatment developed by Scott Henggeler and colleagues at the Family Services Research Center, Medical University of South Carolina (MUSC), which holds the intellectual property; MST Services (Atlanta) licenses it to organisations, not to individual clinicians [source: Blueprints programme profile; Henggeler 2012]. It is a licensed programme with a team structure, not a technique a lone therapist can adopt: you deliver it under its name only as a member of a licensed MST team (see Section 2). Its theory of change: serious antisocial behaviour is maintained by interacting risk factors in the youth's natural ecology (individual, family, peers, school, neighbourhood). The family is the key lever: the therapist first strengthens caregivers' monitoring, discipline and warmth, then caregivers use those capacities to move the youth away from antisocial peers towards prosocial ones and to work with school and probation, so that change is carried by the ecology after the therapist leaves [source: Henggeler 2012]. Qualitative work in England added two further change processes reported by youth: developing future goals and concern about the impact of their behaviour on the family [source: Henggeler 2012].

2. Framework

MST is not organised into fixed sessions or phases. Its organising structure is a recursive "analytic process" (often called the do-loop) repeated every week for every family, inside an ongoing climate of engagement and alignment with the family and key participants [source: Supervisory Manual 1998; Blueprints 2008 slides; Randall & Ramey 2019]. The stages below are the practical sequence of a case; the stage labels are my organisation of the published elements [synthesis].

The analytic process (order as given in the Supervisory Manual, 1998):

Desired outcomes of the family and key participants (caregivers, youth, probation, school, child welfare).
Overarching goals, clarified from the referral problems.
Engagement of the family and key participants.
MST conceptualisation of "fit" (what drives each target behaviour).
Prioritised intermediary goals.
Intervention development and implementation.
Measurement of outcomes.
Assessment of advances and barriers, then re-evaluation, which returns the loop to engagement and fit. Henggeler (2012) gives the same logic in five steps: specify target problems from stakeholders' perspectives; identify ecological strengths; organise the drivers of each problem into a coherent conceptualisation; design integrated interventions with team input; monitor continuously and, if an intervention fails, reconceptualise and modify until it works.

Stage A – Referral and intake. Goal: confirm MST-appropriateness and safety. Typical published inclusion: age 12–17, significant externalising behaviour (chronic or violent offending, aggression, truancy, substance use alongside antisocial behaviour), risk of out-of-home placement or returning from it, multi-system involvement, less intensive treatment ineffective. Typical exclusions: referral primarily for suicidal, homicidal or psychotic behaviour; youth living independently or with no identifiable caregiver after extensive search; sexual offending with no other antisocial behaviour (served by the MST-PSB adaptation, not drawn on here [uncertain]); moderate–severe autism; low-level needs; previous MST unless the ecology has changed [source: Louisiana Medicaid 2024; Randall & Ramey 2019]. The MST supervisor completes an initial psychosocial assessment before entry [source: Louisiana Medicaid 2024]. In MST-CAN a safety checklist is completed at intake (substances, medications, dangerous acts, home environment, firearms) [source: Swenson 2005].

Stage B – Engagement and assessment (roughly first 1–2 weeks). Goals: meet caregivers at home at times convenient to them, gather desired outcomes from every key participant, identify strengths and needs in every system, draft fit hypotheses. Criterion to move on: key caregivers engaged; treatment is not expected to progress until they are [source: Henggeler 2012]. Output: the Initial Case Summary, written by the therapist from the assessment, listing strengths, referral behaviours, overarching goals and "Desired Outcomes of Key Participants", signed by the caregiver and ideally the youth [source: Louisiana Medicaid 2024]. In MST-CAN an ecological safety assessment is completed by week 2 [source: Swenson 2005].

Stage C – Intervention cycles (bulk of treatment). Goals: achieve prioritised intermediary goals (specific, measurable, time-limited) that target the strongest drivers; caregivers do daily or weekly tasks between contacts. Each week the therapist updates the Weekly Case Summary (overarching goals, intermediary goals, intervention steps, review of last week's goals, progress, barriers, supervision feedback) and brings it to team supervision [source: Louisiana Medicaid 2024; Supervisory Manual 1998]. Movement: an intermediary goal met → next priority; not met → identify barriers, revise fit, redesign [source: Henggeler 2012].

Stage D – Tapering, generalisation and discharge. Contact frequency drops towards the end [source: Louisiana Medicaid 2024; Blueprints profile]. Discharge when overarching goals are substantially met, or the youth needs a different level of care, or the family is not engaging despite documented efforts to remove barriers, or consent is withdrawn [source: Louisiana Medicaid 2024]. Case closure categories tracked by the MST Institute: completed, low engagement, placed [source: Randall & Ramey 2019].

Format and dose. Duration typically 3–5 months, average about 4 (operational target about 120 days, range 90–150) [source: Blueprints 2008 slides]. Contact at least weekly and often several times a week; a published average is about 60 hours face-to-face plus about 35 hours of collateral "ecological" contact (school, probation, etc.) over about 4 months [source: Louisiana Medicaid 2024]. Delivery is in the home, school and community, evenings and weekends included; the team covers 24/7 on-call [source: Henggeler 2012]. Caseload 4–6 families per therapist; 2–4 therapists plus a supervisor per team; MST staff deliver nearly all treatment and rarely refer out [source: Blueprints 2008 slides].

What you need before delivering it under the MST name. The organisation must hold an MST licence (MST Services or an approved Network Partner); individuals are not licensed [source: Blueprints profile]. Staff: master's-level therapists preferred (some payers allow limited bachelor's-level staff), master's-level or higher supervisor [source: Louisiana Medicaid 2024; Blueprints profile]. Training: 5-day (about 30-hour) MST orientation within about two months of hire; quarterly on-site boosters (1.5 days); weekly team supervision (1–2 hours, Supervisory Manual: never less than weekly, twice weekly in new programmes); weekly consultation with an MST expert/system supervisor; supervisor consultation monthly [source: Supervisory Manual 1998; Louisiana Medicaid 2024; Blueprints profile]. Fidelity: caregiver-rated Therapist Adherence Measure-Revised (TAM-R) collected around week 2 and every 4 weeks after, entered into the MST Institute database; Supervisor Adherence Measure (SAM) every two months; programme implementation review every 6 months [source: Louisiana Medicaid 2024]. The adherence measures are licensed instruments and are not reproduced here.

3. Guiding principles

The nine MST treatment principles (names as published; one-line meanings paraphrased) [source: Henggeler 2012; Blueprints 2008 slides; Randall & Ramey 2019]:

Finding the fit – assessment exists to explain how each problem makes sense within its systemic context. Practically: for every target behaviour, map the drivers before you intervene.
Positive and strength focused – contacts emphasise positives and use systemic strengths as levers. Practically: every plan names which family, school or community strength it uses.
Increasing responsibility – interventions promote responsible and reduce irresponsible behaviour among family members (caregivers included). Practically: tasks require someone in the family to do something, not just the therapist.
Present-focused, action-oriented and well-defined – target specific, current, observable problems. Practically: goals are written so anyone could tell whether they happened this week.
Targeting sequences – interventions aim at sequences of behaviour within and between systems that keep the problem going. Practically: trace the chain (e.g. argument → youth leaves → time with offending peers → arrest) and break a link.
Developmentally appropriate – fit interventions to the youth's developmental needs. Practically: for older teens, build towards work, school completion and adult support, not only rules.
Continuous effort – interventions need daily or weekly effort by family members. Practically: every contact ends with a task due before the next one, and it is checked.
Evaluation and accountability – effectiveness is assessed continuously from multiple perspectives, and providers are accountable for overcoming barriers. Practically: check outcomes with caregiver, youth, school and probation weekly; failure is the team's problem to solve.
Generalisation – empower caregivers to meet family needs across settings so change outlasts treatment. Practically: the caregiver, not the therapist, leads school meetings and plans by the end.

Further stance rules stated in the sources:

No "resistant" or "unmotivated" labels – barriers to engagement are the team's task to solve [source: Blueprints 2008 slides; Henggeler 2010 slides]. Practically: when a family misses contacts, ask what the barrier is and change your approach.
Families are full collaborators and long-term change agents; goals are set primarily by family members [source: Swenson 2005; Henggeler 2010 slides]. Practically: start from the caregiver's desired outcomes, then negotiate referrers' requirements into them.
Never give up; do whatever it takes; failure is attributed to the team, not the family [source: Henggeler 2012]. Practically: an unmet goal triggers redesign in supervision, not case closure.
The therapist leads clinical decisions and delivers nearly all treatment [source: Blueprints 2008 slides]. Practically: avoid farming out parts of the case; integrate any outside service into the plan.
Caregiver-centred, not child-centred – individual work with the youth must be justified and its gains maintained through caregivers [source: Supervisory Manual 1998; Henggeler 2012]. Practically: if you plan to see the youth alone, state why the caregiver cannot do it and how they will be brought in.
Hypotheses must be tested with evidence – fit drivers are hypotheses, supported or refuted by observation and by the results of interventions [source: Supervisory Manual 1998]. Practically: write what you would see if the hypothesis were wrong.
Proximal before distal – distinguish drivers that act directly on the behaviour from those that act through them [source: Supervisory Manual 1998]. Practically: target harsh, inconsistent discipline before, say, the caregiver's own history.
Services come to the family – home and community delivery, convenient hours, 24/7 crisis availability, low caseloads [source: Henggeler 2012]. Practically: schedule around shift work and transport, not the clinic diary.
Hands-off – no restraint or restrictive procedures [source: Louisiana Medicaid 2024].
Safety first (MST-CAN) – the family safety plan is the first intervention and is reviewed every session [source: Swenson 2005].

4. Intervention inventory

MST does not have a proprietary set of techniques. It integrates existing evidence-based methods (behaviour therapy, parent management training, cognitive-behavioural therapy, structural and strategic family therapy, and pharmacological treatment where indicated) inside the nine principles and the analytic process [source: Blueprints 2008 slides; Henggeler 2012]. The entries below are the procedures the sources describe. Where the sources name a procedure but do not give its steps, the steps are standard practice for that method, written by me and marked [synthesis]; the detailed chapter protocols of the 2009 manual (family, peer, school, individual, social support, substance use chapters) are not drawn on [uncertain].

4.1 Gathering desired outcomes of key participants

Purpose / when: first contacts and whenever a new stakeholder appears. Sets overarching goals that every party recognises; prevents the family and referrer pulling in different directions [source: Supervisory Manual 1998; Louisiana Medicaid 2024].
Steps: (1) Ask the caregiver(s) what would need to be different at the end of MST for them to say it worked. (2) Ask the youth the same. (3) Contact each key participant (probation officer, social worker, teacher/head of year) and record their required outcomes in their own terms. (4) Translate each into observable referral behaviours (e.g. "no new arrests", "attends school every day", "no physical fights at home"). (5) Reconcile: show the caregiver where referrers' requirements overlap with their own wishes and agree a short list of overarching goals. (6) Record them in the Initial Case Summary and have the caregiver (and ideally youth) sign [steps 1–5 synthesis built on the published sequence].
Example language (illustrative): "Picture four months from now and things are going well. What would you be seeing at home that you're not seeing now?" / "Probation needs him to stop missing curfew. You said you want him home and talking to you in the evenings. Those fit together. Can we make that one of our goals?"
Watch for: goals that are vague ("better attitude") or trivial, which the Supervisory Manual lists as a sign of poor engagement; goals owned only by the referrer. Working if the caregiver can restate the goals and spontaneously reports on them.

4.2 Engagement and alignment

Purpose / when: throughout; treatment is not expected to progress until key caregivers are engaged [source: Henggeler 2012].
Steps: the published core strategies are identifying strengths across systems, reflective listening, empathy, instilling hope, reframing, authenticity and flexibility, and positive communication [source: Henggeler 2012]. In practice: (1) meet at home at a time the caregiver chooses, including evenings and weekends; (2) open with what the caregiver is already doing well; (3) reflect the caregiver's frustration and fatigue before proposing anything; (4) reframe blame-laden descriptions into solvable patterns; (5) deliver one small, early practical win (e.g. a call to school that ends a pending exclusion) to build credibility; (6) treat the caregiver as the expert on the family and yourself as the person who helps design and troubleshoot plans [steps 1–6 synthesis from the listed strategies].
Example language (illustrative): "You've kept this family together through a lot. I'm not here to take over. I'm here to help you get your plan to work." / "It sounds like every call from school has been bad news, so not picking up made sense. Let's change what those calls are about."
Watch for: the Supervisory Manual's signs of engagement (keeps appointments, completes tasks, emotionally invested in sessions, progress towards goals) versus signs of trouble (hard to schedule, missed appointments, plans not followed, trivial goals, uneven progress, dishonesty about key facts) [source: Supervisory Manual 1998].

4.3 Strengths and needs assessment across systems

Purpose / when: early, then updated; strengths become intervention levers [source: Henggeler 2012].
Steps: for each system list strengths and needs. Published examples of strengths: youth – interests, academic skills; family – problem-solving ability, affective bonds; peers – prosocial activities; school – good classroom management, after-school activities; neighbourhood – involved neighbours, community groups [source: Henggeler 2012]. Gather information from multiple sources (caregiver, youth, extended family, teachers, probation, records) and observe directly at home and school [synthesis].
Example language (illustrative): "Who in your life could you call at 10 p.m. if he didn't come home?" / "What's the one class he doesn't skip? What's different about that teacher?"
Watch for: a needs list with no strengths, which usually means assessment has been done from records rather than with the family [synthesis].

4.4 Fit assessment ("fit circles")

Purpose / when: for every referral behaviour and every intermediary goal that is not progressing. Explains why the behaviour occurs in this ecology so interventions can target its drivers [source: Henggeler 2012; Randall & Ramey 2019].
Steps: (1) Write one specific referral behaviour in the centre (e.g. "marijuana use"). (2) Around it, list hypothesised drivers drawn from all systems; the published example for substance use lists drug-using peers, easy access, no consequences, boredom and low caregiver monitoring [source: Randall & Ramey 2019]. (3) Classify drivers as proximal (directly tied to the behaviour in daily interactions, e.g. harsh, inconsistent discipline as a driver of aggression) or distal (acting through proximal ones) [source: Supervisory Manual 1998]. (4) For each driver, note the evidence for it and what evidence would refute it [source: Supervisory Manual 1998]. (5) Do the fit with the caregiver, so that no single person or system is blamed; MST Services describes fit circles as a way to avoid blaming anyone for the youth's behaviour [source: MST Services blog]. (6) Rank drivers by strength and changeability and choose the top ones for intermediary goals [source: MST Services blog; Henggeler 2012]. Drawing format beyond "behaviour in the centre, drivers around it" is not described in the sources [uncertain].
Example language (illustrative): "Let's put 'skipping school' in the middle and write down everything that makes it more likely. No blaming, just what happens." / "If the main thing were the friends he walks with, what would we expect on days he walks alone?"
Watch for: drivers that are labels ("conduct disorder", "bad attitude") rather than sequences; all drivers located in the youth; untested hypotheses carried for weeks. Working if interventions aimed at the ranked drivers move the behaviour; if not, the fit is revisited first.

4.5 Overarching and intermediary goals; weekly case summary

Purpose / when: each week, for every case; the backbone of the do-loop [source: Supervisory Manual 1998; Louisiana Medicaid 2024].
Steps: (1) Hold the overarching goals (end-of-treatment outcomes) fixed unless the family's situation changes. (2) Each week set intermediary goals that are specific, measurable and time-limited, aimed at the prioritised drivers. (3) List the intervention steps, who does each, and by when. (4) Next week, record whether each goal was met, the evidence, and the barriers. (5) Bring the summary to group supervision; record the feedback [source: Louisiana Medicaid 2024]. (6) Prepare the summary before supervision so time goes to the cases most in need [source: Supervisory Manual 1998].
Example language (illustrative): "This week's goal: Mum knows where Jay is at 4, 7 and 10 p.m. on all seven days, checked by a call or a text photo. We'll count the days next Tuesday."
Watch for: intermediary goals that describe therapist activity ("therapist will meet with school") rather than change in the ecology; the same goal carried unchanged for several weeks.

4.6 Family safety plan and safety checks (MST-CAN; adaptable to standard MST)

Purpose / when: in MST-CAN, the first intervention with every family; also wherever violence, abuse risk, weapons or substance-related danger are present [source: Swenson 2005; extension to standard MST is synthesis].
Steps (MST-CAN): (1) Complete the intake safety checklist (substances, medications, dangerous acts, home environment, firearms). (2) Write a family safety plan specifying who in each system acts if a risk arises, whom the parent or youth calls, the therapist's/on-call number, and who supervises the children if the parent must leave. (3) Have all parties sign it. (4) Review it at every session and repeat safety checklists weekly. (5) Complete an ecological safety assessment by week 2 [source: Swenson 2005]. For firearms or lethal means, safe storage or removal from the home is agreed with the caregiver [synthesis, standard lethal-means counselling].
Example language (illustrative): "Before anything else, let's agree what happens if things start to heat up: who leaves, who you call, and who looks after the little ones."
Watch for: plans that depend on a person who has not agreed to their role; a plan nobody can find. Working if family members can say what they would do and use it in a crisis.

4.7 Increasing caregiver monitoring and supervision

Purpose / when: when low monitoring is a fit driver, as it commonly is for offending, substance use, truancy and curfew violations [source: Henggeler 2012; Randall & Ramey 2019].
Steps: published elements: caregivers are coached to improve monitoring and supervision [source: Henggeler 2012]; neighbours or extended family can be enlisted, e.g. to supervise after school until the caregiver is home [source: Henggeler 2012]; caregivers may connect with the parents of the youth's friends [source: Henggeler 2012]; school staff can confirm attendance daily, as in the MST Services case where the counsellor agreed to call the mother each morning [source: MST Services blog]. Concrete procedure [synthesis]: (1) map the youth's typical week hour by hour and mark unsupervised high-risk windows; (2) agree with the caregiver what they need to know (where, with whom, doing what, when home); (3) choose check methods that fit the family (calls at set times, photo texts, calls to the host parent, spot checks); (4) recruit back-up monitors for times the caregiver is at work; (5) link monitoring results to the rules-and-consequences plan (4.8); (6) review the log weekly.
Example language (illustrative): "You can't be there at 3:30, so who can? Your sister lives two streets away. Would she take him on weekdays if we asked her together?"
Watch for: monitoring the caregiver cannot sustain (e.g. relies on quitting a job); youth lying about whereabouts, which calls for verification through other adults. Working if unaccounted-for hours fall and the caregiver detects violations quickly.

4.8 Discipline: clear rules, rewards and consequences

Purpose / when: when inconsistent, harsh or absent discipline is a driver; the aim is consistent, less harsh discipline [source: Supervisory Manual 1998; Henggeler 2012]. Draws on parent management training and social learning approaches [source: Blueprints 2008 slides; Henggeler 2012].
Steps [synthesis: standard behavioural parent-training procedure; the MST manual's own version is not drawn on]: (1) With caregivers, pick a small number of rules tied to the referral behaviours (curfew, school attendance, no drugs at home). (2) Define each rule so compliance is unambiguous. (3) Agree privileges the youth values (phone, money, outings, later curfew) and make them contingent on compliance; build in rewards, not only penalties. (4) Agree consequences in advance that caregivers can deliver every time without escalation (loss of a defined privilege for a defined period, extra chores); exclude physical punishment. (5) If two caregivers are involved, get them agreed before the youth is told. (6) Caregiver presents the plan to the youth calmly, with the therapist present; write it down. (7) Track daily; review weekly; adjust contingencies that are not working rather than abandoning the plan.
Example language (illustrative): "Let's choose three rules you're willing to back up every single time, even when you're tired." / To the youth, with the caregiver leading: "Your mum's going to explain the new deal. You'll get your phone back each evening you're home by nine."
Watch for: consequences the caregiver will not deliver; escalation into physical confrontation (safety plan); caregivers who back down under pressure, which points to caregiver barriers (4.12). Working if rule-breaking falls and the caregiver applies the plan without the therapist.

4.9 Improving family affective relations

Purpose / when: when low warmth, high conflict or a disengaged relationship drives problems; MST attends to both the instrumental (supervision, discipline) and the affective (warmth, conflict) side of family life [source: Henggeler 2012].
Steps [synthesis]: (1) Identify times the caregiver and youth get on (shared interests, a relative they both like). (2) Schedule short, regular, low-demand positive time with no discipline discussion. (3) Coach the caregiver to notice and name positive behaviour. (4) Keep conflict topics for planned problem-solving sessions (4.10).
Example language (illustrative): "When was the last time the two of you laughed together? What were you doing?"
Watch for: caregivers too angry to offer warmth yet; first address their exhaustion or support needs.

4.10 Family problem-solving training

Purpose / when: recurring conflicts, or to equip the family for future problems (generalisation) [source: Swenson 2005].
Steps: the published sequence is: define the problem; generate alternative solutions; evaluate and choose one; plan how to carry it out [source: Swenson 2005]. Run it on a live, moderate family problem; the therapist models, then hands facilitation to the caregiver; review the outcome at the next contact [synthesis].
Example language (illustrative): "Let's just name the problem first, without solving it. Then everyone gets to throw out ideas, even daft ones."
Watch for: sessions turning into blame; stop and return to step 1.

4.11 Family communication training

Purpose / when: when negative communication (criticism, yelling, sarcasm) fuels conflict sequences [source: Swenson 2005].
Steps: families assess their own negative communication habits and their effects, then practise and model constructive alternatives, with correction through problem-solving discussion [source: Swenson 2005]. In practice: identify one habit at a time, rehearse an alternative in session, assign home practice [synthesis].
Example language (illustrative): "When you said 'you always', what happened to his face? Try it again starting with what you want him to do."
Watch for: practice that happens only in session; ask for a specific example from the week.

4.12 Addressing caregiver barriers to effective parenting

Purpose / when: when the caregiver cannot carry out monitoring or discipline plans because of their own depression, substance misuse, low social support, or marital/partner conflict [source: Supervisory Manual 1998; Henggeler 2012].
Steps: published elements: caregiver depression and social support may become targets when they affect parenting [source: Supervisory Manual 1998]; caregiver mental-health and substance problems are addressed as barriers [source: Henggeler 2012]; therapists do not provide individual therapy to caregivers or marital therapy unless it directly affects the youth's treatment [source: Louisiana Medicaid 2024]; individual caregiver strategies increase in MST-CAN [source: Swenson 2005]. Procedure [synthesis]: (1) put the caregiver barrier on the fit circle for the failed parenting plan; (2) decide whether the MST therapist addresses it within scope (e.g. brief CBT for depressed mood, partner agreement on rules) or links to a specific outside provider; (3) if outside, integrate that provider into the weekly plan rather than handing off; (4) re-test the parenting plan once the barrier eases.
Example language (illustrative): "Every plan we make falls apart in the evening, and you've told me evenings are when you feel lowest. Can we look at that together, because it's part of the same problem?"
Watch for: drifting into caregiver-only therapy with no link to youth targets.

4.13 Structural and strategic family interventions

Purpose / when: when the fit shows problems in family organisation (e.g. caregivers undermining each other, a youth allied with one adult against another, no one in charge) [source: Blueprints 2008 slides; Henggeler 2012 name structural and strategic therapy as conceptual bases].
Steps [synthesis: standard structural/strategic moves; MST-specific protocol not drawn on]: (1) Identify the sequence (who does what, then what) around the problem. (2) Meet the adults first to agree a joint position. (3) Strengthen the caregiving subsystem: adults decide rules together; the youth is not party to adult disagreements. (4) Assign tasks that change the sequence (e.g. the less involved parent handles curfew this week). (5) Reframe behaviour to reduce blame and increase willingness to act.
Example language (illustrative): "When you two disagree in front of him, he wins the argument. What if you sorted it out between yourselves first and then told him together?"
Watch for: one caregiver sabotaging the plan; meet them alone to hear their concerns (see 5.2).

4.14 Building informal social supports for the family

Purpose / when: when caregivers are isolated or overloaded, and for sustaining gains after discharge (generalisation) [source: Henggeler 2012; manual chapter 7 "Building Social Supports for Families" (title only)].
Steps: enlist neighbours or extended family, for example to supervise the youth after school [source: Henggeler 2012]; help caregivers build collaborative relationships with teachers and community professionals [source: Henggeler 2012]. In practice [synthesis]: (1) map the caregiver's actual and potential supports; (2) identify a specific, time-limited request each could meet; (3) rehearse the request with the caregiver; (4) caregiver makes the request; (5) reciprocate where possible so the support lasts.
Example language (illustrative): "Let's practise how you'd ask your neighbour. What's one thing you could offer her in return?"
Watch for: supports who themselves pose risk (offending, substance use); reliance on paid professionals only, who leave when cases close.

4.15 Peer interventions

Purpose / when: when association with antisocial peers or peer rejection drives the behaviour [source: Henggeler 2012; Randall & Ramey 2019].
Steps: published elements: reduce association with deviant peers, increase affiliation with prosocial peers, caregivers connect with the parents of the youth's friends to support monitoring, and social-skills training for rejected or neglected youth [source: Henggeler 2012]; reduce association with gang-affiliated peers [source: Supervisory Manual 1998]. The caregiver, not the therapist, leads [source: Henggeler 2012]. Procedure [synthesis]: (1) caregiver and therapist list the youth's friends and rate each as prosocial or antisocial, using information from school and other parents; (2) caregiver sets contingencies limiting time with antisocial peers (privileges tied to compliance; see 4.8); (3) identify and enrol the youth in at least one structured prosocial activity matching their interests (sport, job, youth club, faith group); (4) caregiver facilitates contact with prosocial peers (transport, invitations); (5) monitor through the methods in 4.7.
Example language (illustrative): "You know which of his friends are trouble and which aren't. Let's make it easy to see the good ones and harder to see the others."
Watch for: bans that drive contact underground; lack of an attractive alternative activity. Working if time with antisocial peers drops and the youth names new activities.

4.16 School and vocational interventions

Purpose / when: when attendance, behaviour, academic difficulty or poor home–school relations drive the problem; or for older youth, to build employment [source: Henggeler 2012; manual chapter 5 (title only)].
Steps: published elements: engage teachers and school staff; design interventions that fit the school context; build family–school collaboration; help caregivers advocate for appropriate school services [source: Henggeler 2012]. MST Services case example: the therapist accompanied a mother to a school meeting where she stated her expectations; the counsellor then agreed to call her each morning to confirm arrival, increasing monitoring [source: MST Services blog]. Procedure [synthesis]: (1) prepare the caregiver for school meetings (goals, what to ask, how to stay calm); (2) attend the first meetings with them, then step back; (3) set up a daily or weekly home–school communication channel that includes good news; (4) link school reports to home contingencies; (5) request assessment for learning needs where suspected; (6) for older youth, plan vocational routes and job search with the caregiver.
Example language (illustrative), to caregiver before a meeting: "You lead. I'll be there in case you want backup, but they need to hear from you that you expect him in every day."
Watch for: school staff who expect the therapist to manage the youth; caregivers avoiding school because past contacts were hostile (treat as a barrier, not apathy [source: MST Services blog]).

4.17 Individually oriented interventions with the youth

Purpose / when: only when an individual factor (e.g. impulsivity, poor problem-solving, depression, anxiety, trauma symptoms) is a driver and cannot be addressed through caregivers; kept to a minimum and justified [source: Supervisory Manual 1998; Henggeler 2012; manual chapter 6 "When and How to Conduct Individually Oriented Interventions" (title only)].
Steps: use cognitive-behavioural techniques with evidence for the problem, e.g. problem-solving training, CBT for depression or anxiety [source: Henggeler 2012; Supervisory Manual 1998]. Integrate with the family: where possible coach the caregiver to deliver or prompt the skill, e.g. a caregiver supporting CBT work on a teen's depression [source: Henggeler 2012]. Procedure [synthesis]: (1) write the justification into the weekly summary; (2) teach the skill to the youth; (3) brief the caregiver on how to prompt and reward its use; (4) measure the target weekly.
Example language (illustrative): "When you're about to blow up at a teacher, what's the first thing you notice in your body? Let's build a plan for that moment, and then show your dad so he can remind you."
Watch for: individual sessions replacing caregiver work; gains that appear in session only.

4.18 Functional analysis of a problem sequence

Purpose / when: to locate intervention points in a sequence (e.g. an incident of physical discipline in MST-CAN, or drug use) [source: Swenson 2005].
Steps: identify the sequence of events leading to the incident (triggers, thoughts, feelings, actions, consequences) and where to intervene; this may be done separately with the parent and the child; results feed a self-management plan [source: Swenson 2005].
Example language (illustrative): "Take me through that evening step by step, starting before you got home."
Watch for: a parent minimising; collect the youth's account and other adults' accounts too.

4.19 Substance-use interventions (contingency management and related)

Purpose / when: when the youth's substance use is a referral behaviour or driver; outpatient/home-based work is preferred over residential or hospital care [source: Swenson 2005; manual chapter 8 "Treating Substance Abuse" (title only)].
Steps (as listed in Swenson 2005): gather information on use from everyone in the ecology; contingency management using a point and level system; functional analysis of use; weekly urine drug or breath screens; coping with cravings; self-management planning; drug-refusal skills; practical help with jobs, housing and recreation [source: Swenson 2005]. Run by caregivers where possible: caregiver awards points for clean screens and target behaviours and exchanges them for privileges [synthesis]. Detailed MST contingency-management protocol is [uncertain].
Example language (illustrative): "A clean test this week earns the points for your Saturday; we'll check together on Friday."
Watch for: screens collected inconsistently; caregivers giving privileges regardless of results; screening done in a punitive way that damages engagement. Obtain consent and follow local law on testing minors [synthesis].

4.20 Anger management for caregivers (MST-CAN)

Purpose / when: caregivers whose anger drives harsh or abusive discipline. The aim is self-controlled parenting, not reduced authority [source: Swenson 2005].
Steps: identify triggers plus physiological and cognitive cues, ranked in order of escalation; teach de-escalation: controlled breathing, relaxation, cognitive restructuring, self-instruction, considering consequences in advance [source: Swenson 2005].
Example language (illustrative): "Let's rank the things he does from 'mildly annoying' to 'I see red', and work out what you'll do at each level."
Watch for: practice only in calm conditions; rehearse with realistic triggers.

4.21 Abuse clarification (MST-CAN)

Purpose / when: after physical abuse, once safety is established, to have the maltreating parent take responsibility to the child [source: Swenson 2005].
Steps: the parent writes a letter describing the abuse, taking full responsibility, absolving the child of blame, apologising and saying what will change; the letter is reviewed beforehand by the team and other adults in the ecology; the parent reads it to the child and family in a structured session with the child's and family's input [source: Swenson 2005].
Example language (illustrative), to parent while drafting: "The letter needs to make clear that what happened was your responsibility, not his."
Watch for: drafts that blame the child or minimise; do not proceed until the letter meets the criteria. Child's safety and readiness take priority [synthesis].

4.22 Trauma-focused treatment (MST-CAN)

Purpose / when: PTSD symptoms in the youth or caregiver [source: Swenson 2005].
Steps: 9–12 sessions of about 90 minutes; options include prolonged exposure, cognitive restructuring and stress inoculation training, selected by symptom profile [source: Swenson 2005]. Exposure safety [synthesis]: do not begin while abuse risk is current or the safety plan is unstable; obtain informed consent from youth and caregiver after explaining that distress rises temporarily; screen for dissociation, active self-harm, suicidal risk and substance intoxication; teach coping skills first; end each session with distress reduced.
Watch for: avoidance and missed sessions after exposure; worsening symptoms beyond the expected short-term rise.

4.23 Psychiatric consultation and medication

Purpose / when: when a psychiatric condition (e.g. ADHD) is a driver; MST includes evidence-based pharmacological treatment as an option [source: Blueprints 2008 slides; Henggeler 2012].
Steps: refer for psychiatric evaluation and medication management, then integrate adherence and monitoring into the family plan [source: Louisiana Medicaid 2024]. No dosing guidance here.

4.24 Crisis response and on-call cover

Purpose / when: any time; the team provides 24/7 availability and members cover for each other [source: Supervisory Manual 1998; Henggeler 2012].
Steps [synthesis]: give the family the on-call number with the safety plan; in a crisis, use the safety plan first; after the crisis, add it to the fit and the weekly summary. Suicidal, homicidal or psychotic presentations follow standard risk assessment and may need a different level of care [source for level-of-care point: Louisiana Medicaid 2024].

4.25 Using supervision, consultation and adherence feedback

Purpose / when: weekly; the quality-assurance system is part of the treatment [source: Supervisory Manual 1998; Henggeler 2012].
Steps: submit weekly case summaries; present cases with fit, goals, results and barriers; take the team's suggestions back to the family; review TAM-R feedback with your supervisor; follow your professional development plan [source: Supervisory Manual 1998; Louisiana Medicaid 2024]. Supervisors may join you in the field or review session recordings [source: Supervisory Manual 1998].

4.26 Generalisation, tapering and discharge planning

Purpose / when: from the start, and explicitly in the last weeks; principle 9 [source: Henggeler 2012].
Steps [synthesis built on principle 9 and tapering]: (1) progressively hand leadership of every plan to the caregiver; (2) reduce contact frequency; (3) caregiver rehearses how they would handle likely future problems with the problem-solving steps; (4) confirm informal supports and school contacts will continue; (5) review overarching goals with every key participant; (6) close with a written summary of what worked.
Example language (illustrative): "If this happens again in six months, what would you do first? Who would you call?"

5. Handling problems

The MST rule that frames everything here: lack of progress or engagement is a barrier for the team to solve, never evidence that the family is "resistant" [source: Blueprints 2008 slides; Henggeler 2012]. The default response to any problem is to run the analytic process on the problem itself: put it on a fit circle, test hypotheses, redesign, bring it to supervision [source: Henggeler 2012; Supervisory Manual 1998].

5.1 Poor engagement (missed contacts, hard to schedule, plans not followed)

Recognise: the Supervisory Manual's warning signs: difficulty scheduling, missed appointments, plans not followed, trivial goals, uneven progress, dishonesty about key facts [source: Supervisory Manual 1998].
Respond: do a fit circle on non-engagement. Common family barriers named in the sources: mistrust of the system, parents feeling disempowered, conflicting messages from relatives, and expecting the therapist to "fix" the child [source: Swenson 2005]. Concrete moves [synthesis]: change contact times and places; check that goals are the caregiver's, not only the referrer's; deliver a quick practical win; clarify that MST is not probation; bring in the relative giving conflicting messages; reframe the therapist's role as helping the caregiver's plan succeed.

5.2 Therapist-side barriers

The Supervisory Manual names practitioner-level barriers and responses [source: Supervisory Manual 1998]:

Child-centred drift – justify individual work and make sure gains are maintained by caregivers.
Cultural disconnect – recruit diverse staff, use team members, draw on community resources.
Discomfort with sensitive topics – rehearse with team members.
Negative reaction to a family member – use the "cup of coffee" approach: meet that person informally to understand their perspective.
Therapist personal problems or stress – the supervisor links the therapist with outside help but does not act as their counsellor.

5.3 Interventions not working (stuck cases)

Respond: re-evaluate the fit first (was the driver wrong, or right but the intervention poorly implemented?), then check implementation (did the caregiver have the skill, time and will?), then redesign; never close a case simply because an intervention failed [source: Henggeler 2012]. Ask: are intermediary goals small and specific enough? Is a caregiver barrier (4.12) unaddressed? Is a key participant (other parent, grandparent, school) undermining the plan? Are you treating distal drivers while proximal ones run on? [synthesis, using the proximal/distal distinction from Supervisory Manual 1998]. Take the case early in supervision and ask the consultant for a fresh fit [synthesis].

5.4 Non-adherence to between-session tasks

Respond [synthesis]: treat each missed task as data: was it the caregiver's idea, was it feasible this week, did they understand it, did something in the ecology block it? Shrink the task, rehearse it in session, set a check-in call midway, and pair it with a reinforcer for the caregiver (e.g. acknowledgement from school). Principle 7 requires daily or weekly effort [source: Henggeler 2012]; adherence is built, not demanded.

5.5 Caregiver wants the youth placed out of home

Respond: keep the focus on maintaining the youth at home and addressing the factors around the behaviour, as in the MST Services case where the mother suggested sending her daughter elsewhere [source: MST Services blog]. Validate exhaustion, add immediate support (respite from relatives, on-call cover, a crisis plan), and set very short-term goals that bring relief within days [synthesis]. Where safety cannot be secured, a placement decision belongs to the statutory agency, and MST tracks placement as an outcome [source: Randall & Ramey 2019].

5.6 Youth refuses to participate

Respond [synthesis]: MST does not depend on the youth's agreement in the way individual therapy does, because the caregiver is the main agent of change [source for caregiver focus: Henggeler 2012]. Keep working through caregivers, school and peers; give the youth a way in through their own goals (getting probation off their back, more freedom) and offer privileges that can be earned.

5.7 Conflict with referring agencies (probation, child welfare, courts)

Respond: keep referrers' desired outcomes in the overarching goals and report progress against them; MST stresses alignment with stakeholders such as probation and child welfare [source: Blueprints 2008 slides; Randall & Ramey 2019]. When agency actions undermine the plan (e.g. sanctions that remove a youth from a new job), negotiate in a meeting led by the caregiver where possible [synthesis].

5.8 Rupture in the therapist–caregiver relationship

Respond [synthesis]: name it directly and early, take responsibility for your part (e.g. a plan that set the caregiver up to fail), ask what would help, and go back to the caregiver's own goals. Bring it to supervision the same week; consider whether a colleague should join a visit. Not addressed specifically in the sources [uncertain].

5.9 Overwhelm and crisis in the family

Respond: use the safety plan and on-call cover [source: Swenson 2005; Henggeler 2012]. Reduce the number of active intermediary goals to the one with greatest leverage; increase contact frequency temporarily [synthesis].

5.10 Safety concerns, abuse disclosure, suicidality or psychosis

Respond: follow mandatory reporting law and agency child-protection procedures [synthesis]. MST-CAN exists for families where physical abuse or neglect is the referral concern and has a modified structure (smaller caseloads, psychiatrist involvement, caseworker in supervision) [source: Swenson 2005]. If suicidal, homicidal or psychotic presentations become primary, conduct a standard risk assessment, agree lethal-means safety (secure storage or removal of firearms and medications), arrange urgent psychiatric assessment and consider whether a different level of care is needed; these are exclusion criteria for standard MST [source for exclusion: Louisiana Medicaid 2024; procedures synthesis].

5.11 Modality-specific difficulties [mostly synthesis]

Therapist workload and burnout from 24/7 on-call and intensive cases: rotate on-call within the team as designed [source: Henggeler 2012]; use the supervisor's role in linking you to outside help [source: Supervisory Manual 1998].
Drifting off-model (e.g. long individual sessions, unfocused talking at home): use the weekly summary format to check that every contact served an intermediary goal; low TAM-R scores are the signal [source for TAM-R role: Louisiana Medicaid 2024].
Second course of MST requested: published criteria require current eligibility, specific changes in the ecology since the first course, a reasonable expectation of success and payer authorisation [source: Louisiana Medicaid 2024].
Treatment running past 5 months: check whether goals are still realistic; some payers require new signed case summaries after 180 days [source: Louisiana Medicaid 2024].
Discharge for non-engagement: permissible only after documented efforts to remove barriers [source: Louisiana Medicaid 2024]; record what was tried.

Sources

Sources:

Further reading (not drawn on beyond contents):

Henggeler, S. W., Schoenwald, S. K., Borduin, C. M., Rowland, M. D., & Cunningham, P. B. (2009). Multisystemic Therapy for Antisocial Behavior in Children and Adolescents (2nd ed.). Guilford Press.
Henggeler, S. W., Schoenwald, S. K., Borduin, C. M., Rowland, M. D., & Cunningham, P. B. (1998). Multisystemic Treatment of Antisocial Behavior in Children and Adolescents. Guilford Press.

Further reading (not drawn on): PMC review PMC4475575; MST Services clinical documentation guidance (.docx); Connecticut MST Practice Guide 2019. Detailed manual protocols for family, peer, school, substance-use and MST-PSB work therefore rest on summaries and are marked [synthesis] or [uncertain] above.

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