Redesign one feature for a reason you can show

Save the first test result before changing the model. A slipping tab, for example, gives a focused reason to revise a join; documenting that link makes iteration more than repeatedly making something different.

Save a note or photograph of the first version. The revision becomes easier to explain when its connection to the test evidence is visible.

Connect the change to the evidence

1. Record the first outcome.
2. Explain one change.
3. Repeat the test.

Raising a slipping tab follows evidence about the slipping join.

Random changes make learning harder to trace. Why was that feature changed?

Use before-and-after boxes.

Resources

• Paper Bridge Design Challenge — Apply a stated span and test method when comparing the paper prototypes.

Further reading

• Australian Curriculum Version 9 — Technologies overview

Read next

• A materials limit belongs in the brief from the start
• Find the component that changed during the model test
• The same load can behave differently when it is spread out

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