---
title: "Iterative Design and Prototyping"
description: "Develop a design through repeated cycles: build a model or prototype, test it against criteria, use the results to find weaknesses, and modify the design; run the loop several times so each version me"
canonical: https://lightmysky.com/learn/design-and-technology/iterative-design-and-prototyping-mt_fYD3KaViOZ
source: https://lightmysky.com/learn/design-and-technology/iterative-design-and-prototyping-mt_fYD3KaViOZ.md
retrieved: 2026-10-19
---

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# Iterative Design and Prototyping

Develop a design through repeated cycles: build a model or prototype, test it against criteria, use the results to find weaknesses, and modify the design; run the loop several times so each version measurably beats the last

Subject: Design & Technology · Area: Designing & Making · Ages 11 to 14
Page: https://lightmysky.com/learn/design-and-technology/iterative-design-and-prototyping-mt_fYD3KaViOZ

## Ready when they can

- Build a rough prototype or model to test an idea before making a final version
- Test a prototype against criteria, record the results, and identify the main weakness (e.g. 'the bridge failed at the joints, not the beams')
- Explain how each version changed and what test evidence prompted the change

## Lesson: The Build-Test-Improve Loop

A prototype is a rough, working version of your design. You build it fast, not to keep, but to test. When you test it against your design criteria, you find out exactly what works and what doesn't. That's called iterative design: build, test, find the weak point, improve, then test again. You repeat the loop several times, and each version should beat the one before it.

*(drawing: Round and round: build, test, find the weak point, then improve it before testing again.)*

**Example.** Zara's first bridge prototype held 2 kg before the joints came apart, even though the beams stayed solid. She kept the beam design and only changed how the joints were glued. Version two held 4 kg before it failed.

**Tip.** When something fails, don't throw the whole design away. Find the exact part that failed, change only that part, and test again. That way you know your fix actually worked.

**Recap.** Each version should beat the last, because you tested it, found the real weakness, and fixed only that.

## Practice

8 questions on this page, each with its working shown.

## Needs first

- [Using Tools Safely](https://lightmysky.com/learn/design-and-technology/using-tools-safely-mt_8_IFOc79VA)
- [Fair testing (age 8+)](https://lightmysky.com/learn/science/fair-testing-age-8-mt_eoPcc4nrBE)
- [Design Briefs and Better Products](https://lightmysky.com/learn/design-and-technology/design-briefs-and-better-products-mt_QeNClHE0EG)
- [Strengthening Structures](https://lightmysky.com/learn/design-and-technology/strengthening-structures-mt_QnYDI3itJY)

## Opens up

- [CAD and Making by Machine](https://lightmysky.com/learn/design-and-technology/cad-and-making-by-machine-mt_jNf8g85YbY)