Ask any group of teachers what they want from a behaviour system and they'll say consistency.
What they mean is: I want everyone to do it my way.
Not deliberately. Not selfishly. But that's the honest version of what they're asking for. They want every adult in the building to enforce the rules in the order they enforce them, at the moment they'd enforce them, in the tone they'd use. They want their flavour of consistency. The problem isn't that this is unreasonable. The problem is that nobody says it out loud, so nobody ever works out what they actually agree on.
Here's what real consistency looks like.
You can only be consistent about expectations that are reasonable.
Here's a test I use. Imagine your parents are sitting behind a glass box, watching you teach. Would they look at this expectation and think: yes, that's fair?
Take a simple one. Is it reasonable to expect students to stop and listen to their teacher for two or three minutes at the start of a lesson? Nobody behind that glass would say no. It's reasonable. Which means you can implement a reasonable response when it doesn't happen: circle a 1 next to a student's name, call it an official reminder, and move on.
Reasonable expectations make reasonable responses possible. If the expectation is unreasonable, any response looks unfair. If it's too low, nobody takes it seriously. Getting this right is the foundation everything else sits on.
Proportionate. Applied without making the student feel like they've been made an example of.
A consequence students consider grossly unfair won't deter the next incident. It'll generate resentment, and resentment turns small problems into bigger ones. This is not about being soft. It's about not triggering a spiral you didn't need to start.
The teachers with the most consistent outcomes are not the most flexible. They're the most thoughtful in advance.
Think about speed cameras. The effective approach isn't to put a camera on every road. It's to decide where the cameras should go: the highest-leverage moments, the places where a breach costs the most. A good teacher does the same thing. They don't plan for every moment of the day. They plan for the hardest ones: the arrival routine, the instruction students most often push back on, the transition that tends to go wrong. Those moments are worked out before the lesson starts. When they arrive, there's nothing to improvise.
That's what principles-first looks like. It can look like rigidity from the outside, because it holds under pressure. But it's not inflexibility. It's preparation.
When a student has a pattern of problems, the conversation happens in advance of the lesson, not during it. Something like: "I know this has been an issue. I want to keep the roads safe. If you can stay under the limit today, there's a class-wide reward at the end."
What destroys consistency is adjusting in the moment because a student argues, because you're tired, because it's easier to let it go. Students notice this instantly. They learn that no means maybe, and maybe means push a little harder. The cameras only work if they're where you said they'd be.
Consistency applies to rewards just as much as consequences. If some students are recognised routinely and others are overlooked, or the bar for recognition shifts depending on the day, students stop trusting the system. Consistent recognition, applied fairly and predictably, is part of what makes everything else hold.
This is the one that matters most.
When a student faces a consequence, only their behaviour should determine what happens. Not how they argue. Not how upset they are. Not whether they apologise convincingly, or tell you they're having a hard day.
The moment a student works out that their response to a consequence changes the consequence, they stop learning from it. They start learning how to manage you instead.
Only the choice decides. Hold that, and everything else becomes more consistent.
The best illustration of what consistency looks like when you've actually got it isn't a principle. It's a test.
Ask a randomly selected teacher what happens when a student refuses a reasonable instruction. Then ask another. Then ask a lunchtime supervisor. Then ask a student.
If the answers are broadly similar, you have a system. If they're not, you have something else. Read about the Green Wig Test here.