Think of one digital system you used today or this week in Ireland. A Leap card on the bus, a self-checkout in a shop, a weather app before PE, or a machine on a farm. What did you put in, and what came out?

Hands up: which one do you think quietly collects the most data about you?

Technologists sketch a system before they build or fix it. Here are the words they use.

On the board there is an empty Input → Process → Output map and four cards taken from one bus journey. Three of the cards are straightforward, and you will call out where each of those belongs as we place them together.

The fourth card is the real puzzle. Decide whether facts the system quietly keeps count as something that comes out, like a beep or a gate opening, or whether they belong somewhere else on the map, and be ready to say why you think so.

Now you map a system of your own. Each group takes one research card — self-checkout, weather app, smart farming, or eFlow toll tag — with an A3 sheet and markers. Nobody takes the Leap card, because we have already done that one together.

The card gives you clues, not answers, so every choice your group makes should be something you can point back to in the clues rather than a guess. The steps on the board list what has to be finished on the poster before the short share at the end.

This is your technologist's sketch: clear labels beat fancy drawing. Capture enough so you can teach the class how the system works.