What's going on inside an examiner's head — the Part 3 decision tree!

If you've got your Part 3 test coming up, you've probably been drilled on the 17 sub-competences and the 0–3 marking scale. That's useful to know, but it's not what the examiner is actually thinking about in the car. What they're really doing is running a decision tree. Once you can see it, the whole test gets a lot less mysterious.

Here's the logic.

It starts the moment your pupil begins to go wrong. Not when something goes catastrophically wrong — when a fault starts to emerge. A late check, a wide line through a junction, a hesitant gear change. This is the examiner's first cue, and the first question in their head is always the same.

Did you prevent it? Did you see it developing and coach early, before the risk had a chance to build? If the answer is yes, congratulations — you've just demonstrated the single most prized skill in client-centred driver training. You're on the Grade A route. A quick discussion with your pupil about risk, consequences, how to fix it, and an adaptation to the plan, and you move on. Clean.

If the answer is no — the fault happened — that's not a fail. It's just a different route. The examiner's next question is how serious was it? Was it a low-risk moment you managed calmly, or was it genuinely safety-critical? That distinction matters more than most candidates realise. Two instructors can respond to the same fault and come away with completely different scores depending on whether their pupil was ever actually in danger.

Low-risk route: you're on the Grade B path. Pull over if you need to. Discuss what happened, how to fix it, adapt. Re-attempt. Transfer responsibility back to the pupil. Then the examiner runs the final check — is it fixed now? If yes, learning has taken place, and the examiner marks you on the quality of that whole cycle.

If it's not fixed, and the fault repeats, that's where most candidates panic. Don't. The examiner isn't looking for you to solve everything on the first try — they're looking for you to recognise the failure and re-adapt.

The loop back is itself evidence of competence. What they don't want to see is you ploughing on through a repeating fault as if it didn't happen.

High-risk route is the one you never want to reach. If the examiner judges the moment was safety-critical — especially if they had to intervene — you're into the territory where your Risk Management score is taking real damage. Score 7 or less in that section and you automatically fail, no matter how strong the rest of your lesson was. And if at any point anyone's in immediate danger, the examiner stops the test there and then.

So what should you actually take away from this?

Three things.

First, prevention beats reaction. Work on seeing faults before they develop. That's the skill that separates Grade A from Grade B instructors in ten minutes of observation.

Second, when a fault does happen, pull over — don't plough on. A proper stop-and-discuss demonstrates more competence than a hurried in-motion correction.

Third, if your first fix doesn't work, change the approach, not just the volume. Ask a different question, try a different framing, break the skill down further. Re-teaching the same way louder isn't adaptation.

The diagram maps all of this onto a single sheet you can pin up while you train. But the real point isn't the chart — it's internalising the logic behind it. Once you do, you stop thinking about the test as a performance and start thinking about it as exactly what it's meant to be: a normal lesson, with your pupil's learning at the centre, and someone in the back seat quietly marking how well you're serving that learning.

That's the job. The chart's just the map