Bring out the tablet stand your group built last lesson. Today the question is: does it work, what does the evidence show, and how will we explain the whole process to the class?

Test your stand against the four success criteria on your Design Brief: it holds the tablet or book upright, it stays steady when the desk is lightly bumped, the tablet or book goes in and out easily, and it is built only from the build kit. Work through these steps in order:

1. Read your success criteria aloud as a group.
2. Set up and run the test exactly as you planned in Part 1. Change nothing mid-way.
3. Jot Trial 1 and Trial 2 (a number or yes/no) on your Design Brief results space or a scratch note. Your Investigation Journal page stays closed until the next step.
4. Write only what you see, not what you hoped for.

The fuller conclusion goes on your Investigation Journal page in the next step.

On your Investigation Journal page, record what the test showed, whether the model met the brief, and one thing you would change next. Keep what you saw separate from what you think it means. Use the Trial 1 and Trial 2 notes you took during the test.

Each group, count how many of your success criteria the model met and be ready to call out that total. We will enter every group's number on the class chart on the board. When all the bars are up, look at the pattern carefully: every group built a stand for the same problem and checked the same four criteria, so the bars can be compared. Which bars are tallest, and what design choices sit behind them? What can a shorter bar still teach us?

We have all seen the results on the chart. So this is not a results round.

Hold up your model. Name one design choice you made that you think no other group made, and say whether it helped.

Listening groups: after every two models, name one choice you would borrow if you built it again, and why.