What ADI-Approved Actually Means, and How to Check
Half the driving schools online say approved. Approved by whom, and to do what? The word ADI has a hard legal meaning in Ireland, and it takes about a minute to check whether someone actually holds it.

People assume approved is just a word schools slap on themselves, like friendly or experienced. It isn't. Not this one. ADI is a specific status the State controls, and knowing what it means keeps you out of the hands of someone who doesn't hold it.
What ADI actually stands for
ADI means Approved Driving Instructor. It's the qualification the RSA requires before anyone can charge to teach you to drive a car. To get it, an instructor has to pass a set of exams and stay on the register. It's not a badge they awarded themselves and it's not the same as a fella who's been driving thirty years and reckons he's grand to teach. Experience is not approval. Only the register is.
Why it's not optional
Here's the part that catches people out. Only an ADI can legally deliver EDT, the twelve mandatory lessons, and only an ADI can sign your logbook. Sit twelve hours with someone who isn't on the register and you've paid for lessons that don't count. The logbook won't be valid, the RSA won't accept it, and you're doing the twelve again with someone who is registered. Approved isn't a nicety here. It's the difference between lessons that count and lessons that don't.
Every Approved Driving Instructor has an ADI number, and it should be displayed on the car. It's not decoration. It's the thing that ties the person to the register, and it's what you check them against.
How to check, in a minute
The RSA keeps a public register of every Approved Driving Instructor in the country. Before you book, ask for the instructor's ADI number and confirm it against that register. A real ADI hands it over without a blink, because they've nothing to hide and they've been asked before. Anyone who gets cagey when you ask for a number has just answered a different question for you.
Approved is the floor, not the finish
Being on the register makes an instructor legal to teach you. It does not make them good at it. The register weeds out the people who shouldn't be charging at all. Choosing well from the ones who are left, the teacher over the clock-runner, is the part that's still on you.
Checking the number is step one of picking properly. For the whole decision, from the register to the red flags, here's how to choose a driving instructor. Ask for the number first. Everything else comes after that.