Every school has the poster. You know the one. A laminated grid on the hallway wall: Be Safe. Be Respectful. Be Responsible. Sometimes it’s a HAWK or a PRIDE acronym. Sometimes it’s a cartoon mascot.
And somewhere in that same school, there’s a student who climbed the fence during last Tuesday’s assembly. Who has been sent to the office fourteen times this term. Whose name appears in the incident log more often than any three other students combined.
The poster does nothing for that student. Neither does the reward assembly, the behaviour bucks, or the Friday raffle. And if the school’s “PBIS programme” consists primarily of those things, it is not actually doing PBIS — it is doing Tier 1 and calling it a system.
What PBIS actually is
Positive Behavioural Interventions and Supports is a three-tiered framework for organising how a school responds to behaviour. The tiers aren’t reward levels. They’re levels of intensity, matched to what students need.
Tier 1 is universal. It covers every student in the building: consistent expectations, predictable routines, common language, a school-wide culture that makes prosocial behaviour easy to do and noticeable when it happens. When implemented well, Tier 1 reaches around 80% of students. They don’t need much more than a well-run environment.
Tier 2 is targeted. Around 15% of students need something more: check-in/check-out systems, small group social skills instruction, increased adult check-ins, structured academic support. These are students for whom Tier 1 isn’t enough, but who don’t yet need a fully individualised plan.
Tier 3 is intensive. The remaining 5% need something built specifically for them — a functional assessment, an individual behaviour support plan, specialist involvement, and consistent implementation across every adult who interacts with them. This is the tier that requires the most from a school and gets the least systematic attention.
The genuine strength of the framework is the consistency it creates across a whole building. When every teacher uses the same language, the same routine, the same recognition system, it removes a significant amount of variability from the environment — and variability is a major driver of problem behaviour. That is worth taking seriously. You can read more about the framework’s foundations in the site’s PBIS glossary entry.
Where it breaks down in practice
The framework is sound. The implementation is often not. Three failure modes come up repeatedly in schools that say they’re doing PBIS.
Failure mode 1: Tier 1 treated as the whole system
This is the most common one. The school rolls out PBIS with a staff training day, installs the expectations poster, sets up a token economy for the whole cohort, and considers the job done. When a student continues to present with significant behaviour, the conversation loops back to Tier 1: “We need to reinforce the expectations more consistently.”
More of the same thing, delivered more loudly, is not a Tier 2 or Tier 3 response. A student who is regularly escalating to physical aggression or who has effectively opted out of the school day is not going to be reached by another reward assembly. They need a different tier, with different tools, delivered by people who have been trained to use them.
Failure mode 2: Rewards without function
Even within Tier 1, school-wide reward systems often get applied without any analysis of whether they’re actually reinforcing behaviour — or which behaviour they’re reinforcing.
If a student’s challenging behaviour is maintained by escape from tasks, and the school’s response is to offer reward tickets for compliance, you have two problems: you haven’t addressed the function of the behaviour, and you may be running a system where the student earns the same tickets as everyone else for sitting quietly while their actual need — escape from demand — goes completely unaddressed.
Reinforcement is defined by its effect on behaviour, not by how much a student likes the prize. That distinction matters enormously in practice, and it applies at the school-wide level just as much as it does in individual sessions.
Failure mode 3: Data collected for compliance, not decisions
Most PBIS implementations involve some form of data collection. Office discipline referrals are tracked, behaviour incidents are logged, suspension rates are monitored. This data is often used to satisfy external reporting requirements, or to demonstrate at an annual review that the school is “doing PBIS.”
What it often isn’t used for is making decisions about individual students or adjusting the system in real time. A student can appear in the data every week for six months and still not trigger a structured Tier 2 or Tier 3 response, because nobody has built a process for that transition. The data sits in a folder. The reasons staff don’t use data the way you want them to are worth understanding on their own terms — but at the system level, the problem is often that there’s no clear decision rule for when data should change what you’re doing.
The fix is the tiers working as designed
None of this is a criticism of the framework. The criticism is of implementations that treat the framework as decoration.
A student at Tier 3 needs a functional behavioural assessment: a structured process for identifying what purpose their behaviour is serving and what environmental conditions are maintaining it. They need an individual support plan built around that function — not a modified version of Tier 1 with extra check-ins, but a genuinely different response. They need adults around them who understand the plan and can implement it consistently across settings.
Understanding the function of behaviour is the foundation that Tier 2 and Tier 3 are built on. Without it, you’re guessing — and guessing about behaviour, no matter how systematic the guessing feels, doesn’t produce reliable results.
If your school has a student who has not responded to Tier 1 supports, the question isn’t “how do we do Tier 1 better?” It’s “what does a Tier 3 response actually look like for this student, and who is responsible for building and delivering it?” A classroom behaviour support plan built around function is a starting point — not a magic fix, but a principled one.
What teachers can do inside an imperfect system
Not every teacher works in a school where PBIS is implemented with fidelity. The leadership may not have prioritised Tier 2 and Tier 3. The data systems may exist on paper only. The specialist support may be under-resourced or inconsistently available.
That’s the reality in a significant number of schools, and it’s not a reason to wait.
A classroom teacher can run a function-informed practice at the classroom level regardless of what’s happening at the school-wide level. That means being systematic about what precedes challenging behaviour, what follows it, and what changes when you adjust those conditions. It means using your own classroom data to make decisions, even if the school-wide system isn’t doing the same. It means building predictable routines and consistent responses that reduce the ambiguity that drives a lot of behaviour problems.
The classroom behaviour resource hub covers the practical layer in detail — antecedent strategies, data tools, and support planning resources that work whether or not your school has a functioning Tier 3 pathway.
For whole-class approaches with strong evidence behind them, the Good Behaviour Game is worth looking at as a structured Tier 1 layer you can implement at the classroom level independently of the school-wide system.
PBIS is a good framework. Used well, with all three tiers functioning as designed and data actually driving decisions, it meaningfully improves outcomes for students — including the ones who need the most support. The issue is that “PBIS” has become a label schools apply to partial implementations, and the students who fall outside Tier 1 are the ones who pay for that gap.
Know which tier your students need. Build toward it. Don’t let the poster be the plan.