MST vs Triple P
A side-by-side comparison: mechanism, evidence, the conditions each treats, philosophical roots, and where they actually disagree clinically.
At a glance
MST
- Tradition
- Family Systems
- Founder
- Scott Henggeler (1998)
- Evidence
- Guideline-recommended
- Focus
- Systemic + Behavioral
- Format
- Family + Community
- Duration
- Short (3-5 months)
Triple P
- Tradition
- Behavioral
- Founder
- Matt Sanders (1999)
- Evidence
- Guideline-recommended
- Focus
- Skill + Psychoed
- Format
- Individual + Group + Community
- Duration
- Variable by level
How they work
MST
Core mechanism: Intensive home-based intervention targets multiple ecological systems (family, peer, school) maintaining antisocial behavior
Ontology: Antisocial behavior maintained by factors across ecological systems — not just the individual youth
Triple P
Core mechanism: Graduated parent skill-building at appropriate intensity level; minimal sufficiency principle uses least intervention necessary
Ontology: Child behavior problems primarily maintained by parenting patterns and family environment; population-level prevention possible
Conditions treated
1 shared · 1 MST-only · 0 Triple P-only
Both treat
Only MST
What each assumes — and misses
MST
Philosophical roots: Bronfenbrenner (ecological systems theory); Haley (strategic family therapy); Minuchin (structural family therapy); pragmatism (what works in context)
Blind spots: Extremely resource-intensive; requires 24/7 therapist availability; limited outside juvenile justice populations
Therapeutic voice: Let's talk about what's working in this family, because that's where we build from.
Triple P
Philosophical roots: Patterson (coercion theory); Bandura (social learning); Sanders (population approach); public health model; Bronfenbrenner (ecological, minimal sufficiency)
Blind spots: Population-level approach may miss individual complexity; culturally normed parenting standards may not translate universally
Therapeutic voice: When he acts out, get down to his level, make eye contact, and give one clear instruction.
Choosing between them
MST (Family Systems) and Triple P (Behavioral) come from different traditions, which means they assume different things about what a person is, what causes suffering, and what the therapeutic relationship is for. The choice between them is often less about "which works better" and more about which set of assumptions fits the client and the therapist.
For deeper coverage: see the full MST and Triple P pages, or use the interactive comparison tool to add more modalities to this comparison.