Iterative Design and Prototyping · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.
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The Build-Test-Improve Loop

Design & Technology · Designing & Making · ages 11-14
Name ______________________   Date ____________

  1. When you test a prototype, you should compare the results with your design criteria.

    Circle one:   True   False

  2. What is the main purpose of building a prototype?

    • To make a finished product ready for sale
    • To test a design idea before the final product
    • To display a finished design without testing it

  3. Which record helps a team explain what it learned from a new prototype version?

    • What changed, the test evidence and the new results
    • Who built the model, its paint colour and the display date
    • What the model cost, the team name and the storage place

  4. Priya needs to test whether a bag can carry books before making the final version. Which prototype is suitable for that test?

    • A physical bag model with suitable materials and joins
    • A paper drawing showing the bag's colours and pattern
    • A small display model made only to show its appearance

  5. Leo tests a small go-kart model. It rolls smoothly in a straight line, but its wheels wobble on turns. What should he investigate first?

    • The body colour and how evenly the paint covers it
    • The wheel movement and how the wheels are attached
    • The seat shape and how neatly its fabric is joined

  6. Using the same criteria and scoring method, a prototype scored 6 out of 10 in round 1 and 9 out of 10 in round 2. How many more points did round 2 score?

    Round 16Round 29

    Answer: ______________

  7. A small boat model takes in water through a cracked hull. Tests show that it floats with the planned load while the crack is sealed. Which change should the team test next?

    • Reduce the planned load without repairing the crack
    • Strengthen or repair the hull where water enters
    • Change the paint colour without repairing the crack

  8. Omar's robot-arm model does not grip a ball. He rebuilds the whole model without recording or investigating what happened. What step did he skip?

    • Choosing a paint finish before testing the next version
    • Making every part larger before comparing test results
    • Using test evidence to decide what needs changing
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Answer key

For grown-ups. Fold this page away before handing over the rest.

The Build-Test-Improve Loop W1-mt_fYD3KaViOZ-s1

  1. True · The criteria state the performance and limits the design needs to meet.
  2. To test a design idea before the final product · A prototype lets a designer test an idea or feature before making the final product.
  3. What changed, the test evidence and the new results · The record links the change to its supporting evidence and shows what happened in the next test.
  4. A physical bag model with suitable materials and joins · The test needs a physical model that can carry books. Its materials and joins must suit the performance being tested.
  5. The wheel movement and how the wheels are attached · The problem occurs at the wheels during turns. That identifies where to investigate, but does not yet prove the cause.
  6. 3 · Subtract the earlier score from the later score: 9 minus 6 equals 3 more points.
  7. Strengthen or repair the hull where water enters · The tests identify water entering through the crack. A hull repair addresses that evidence and still needs retesting.
  8. Using test evidence to decide what needs changing · Omar needs evidence about the grip problem before choosing a repair or a new approach.
Worksheet · LightMySky