PBS, PBL, MTSS: Do the Labels Matter?

PBS. PBL. MTSS. They come from different histories and different countries, and their promises overlap more than their names suggest. I want to separate them, share a very brief overview, and then ask the question most conversations skip: does any of this matter to the person sitting in front of a distressed child or adult right now?

Positive Behaviour Support

PBS grew out of applied behaviour analysis and took root in disability and social care before schools picked it up, anchoring itself to one person instead of a whole system. A practitioner looks at the function behind the behaviour, what it communicates or achieves for the person, not just what the behaviour looks like, and builds a plan around that individual’s needs and preferences. That plan is underpinned by a rights-based focus and aimed squarely at quality of life, with any reduction in restrictive practice following as a natural consequence of less distress and better support rather than standing as the goal in itself.

You’ll find PBS methods used and practitioners commissioned across health services, adult social care and, increasingly, special educational provision. The model itself traces a direct lineage back to Multi-Element Behaviour Support, developed by Gary LaVigna and Tom Willis through the Institute for Applied Behavior Analysis from the early 1990s onward, and that history is getting fresh attention in the UK right now, with a paper newly out in the Tizard Learning Disability Review, by Dotson and Hume, setting out exactly how the model shaped PBS as it took hold here.

Positive Behaviour for Learning (PB4L in NZ)

PBL is a whole-school framework, most established in Australia and New Zealand, with close cousins operating under different names in the UK and the US, PBIS being the best known there, and rather than starting with one child, it starts with the system. Expected behaviours get taught explicitly across the whole school, with data tracking who needs more support and a tiered structure moving students between universal, targeted and intensive layers depending on what that data shows. A school running PBL well can point to the same behaviours being modelled, taught and reinforced from the reception classroom to the staffroom.

Multi-Tiered System of Supports

MTSS is the broadest of the three, built largely in US education systems, and it wraps academic support and behavioural support into one tiered architecture rather than running them as separate initiatives. A school using MTSS might have a PBL-style tier structure sitting inside it for behaviour, alongside a parallel structure for reading or maths, so the framework works less like a single approach and more like scaffolding that other approaches, PBL included, often sit inside. Australia is showing signs of the same shift, with some services and systems moving away from PBL branding and adopting MTSS language instead, even where the underlying tiered practice on the ground looks much the same as it did before.

Where They Meet and Where They Part

None of the three treat sanction as a fix on its own, and behaviour gets investigated before anyone decides what to do about it, whichever framework you’re standing in. Each one also leans on something proactive, teaching or supporting before things reach crisis point rather than waiting for one.

Where they part is scope and home sector, since PBS keeps its anchor on one individual, a plan built around a specific person’s history, needs and preferences, while PBL and MTSS shift that anchor onto the system itself, a school culture or a tier structure meant to catch everyone at once, whichever child happens to need it on a given day.

Move between sectors and the vocabulary shifts even when the underlying intent stays close: a health service might commission a PBS plan while a school down the road runs a PBL framework, and a trust building MTSS architecture could fold a PBL-style tier structure inside it as the behavioural strand, with none of these boundaries fixed, since practices developed under one label get borrowed into another all the time, usually without anyone renaming the training slide.

In Australia, this overlap gets tested directly wherever the National Disability Insurance Scheme intersects with children and young people attending school, since a student can carry an NDIS-funded PBS plan built around their individual needs while sitting inside a school running PBL as its whole-school behaviour framework, and the two rarely get coordinated as though they belong to the same child.

Does It Matter?

In August 2026, BILD’s Centre for the Advancement of Positive Behaviour Support published a paper making exactly this case, aimed specifically at PBS, written by Edwin Jones, Sarah Leitch, Dave Williams and Marie Cresswell, arguing that PBS and physical intervention or restraint training need to be taught, and understood, as separate things. The paper traces how physical intervention providers have typically folded PBS into restraint courses in good faith, wanting to give staff a non-aversive alternative alongside the harder skills, though its own evidence suggests that the blending hasn’t delivered on that intention.

That’s not the only recent paper making a version of this point. A practitioners’ definition of PBS published this year in the Tizard Learning Disability Review, co-authored by ten UK practitioners including our very own James Ridley, sets out nine defining characteristics of PBS precisely because the label has become loose enough that almost any service or course can claim it, producing poor practice and poor quality of life outcomes for the people PBS is meant to serve.

Restraint is one measurable consequence among several: the paper cites the Care Quality Commission’s 2020 review of restraint, seclusion and segregation, which found a PBS plan on file for 91 per cent of the people it looked at, yet judged the quality of those plans poor and flagged unsuitable environments and a service culture built around containment rather than support. It also flags training courses sold under the banner of PBS that turn out, on closer inspection, to be predominantly physical intervention, the same looseness showing up on the delivery side as well as the practice side.

The issue for me is mainly the conflation of PBS and Behaviour Support more generally. Ask most providers what they teach and you’ll hear PBS used as shorthand for the whole of behaviour support, when what’s usually being delivered is a range of approaches with PBS named as one strand inside it.

At PRICE, our own courses are built and described as behaviour support methods with PBS named specifically as one part of the course. Many providers in this market aren’t as clear, since training gets sold as PBS because the term carries weight, and the actual content, including physical technique taught alongside it, often gets folded in under that same label without distinction. That’s the same looseness the CAPBS paper is describing from a different angle, and when behaviour support and PBS become interchangeable in how training gets marketed, the confusion the paper documents in practice starts upstream, in how the course was named and sold in the first place.

The same precision has to cut the other way, since physical techniques taught with no behavioural support framing around them create a different but equally real problem, and nobody in this sector benefits from restraint taught in isolation either.

So does it matter? Yes, and the paper’s evidence backs that up, with the fix sitting in naming precisely what a training programme actually contains: what’s PBS, what’s a wider set of behaviour support approaches, what’s physical technique, and where each one starts and stops. Loose language created this problem, and being specific about course content is what fixes it.

If you’re discussing training, and even more so if you’re commissioning it or reviewing what you already have in place, it’s worth asking directly: what proportion of this course is PBS, what’s broader behaviour support, and what’s physical technique? I’d be curious what answer you get back.