Turn and tell your group: who is your user, and what is the one job your prototype must do for them? Be ready for one or two groups to share with the class.
Today we turn the plan on your Investigation Journal design page (your Design Brief) into a first working model: a prototype. Engineers make a simple first model so they can try it, learn from it, and make it better.
Before anything leaves the kit, get your plan back in your heads. Open the Investigation Journal design page (Design Brief) you completed earlier in this project. Read the problem, the user and what success looks like. Decide together which parts of the sketch you will build first.
Appoint two roles in your group: a materials collector, and a brief-keeper who keeps the Design Brief visible on the table. Everyone else is a builder once those two jobs are set.

This is the bit where your sketch leaves the page: your first real try for your user. It does not have to match the drawing perfectly.
Pause the build. Look at your Design Brief and your prototype side by side.
Talk only for now (no writing yet). Ask: Does this still match the problem and the user? What did we change from the sketch? What still needs to be added before we can test next time?
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