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Design briefs and better products

Investigate and analyse existing products: work out who a product is for, what it does well and badly, how it works and what it is made from; use the analysis to write a design brief and criteria for a better version

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What a learner can do afterwards

  • Take a product (e.g. a lunchbox or a torch) and explain who it is for, how it works and what it is made from
  • Point out strengths and weaknesses of a product against its purpose (e.g. 'the zip is fiddly for small hands')
  • Turn findings into a brief and criteria for an improved design (e.g. 'must open one-handed')

1 · Read

You know a design needs a user and a job. To investigate an existing product, find out who uses it, how it works and what it is made from.

Try it together

A camper's torch uses a battery to supply electricity to a bulb or LED. Its clear lens lets light through. The case protects the parts inside. Hard plastic alone does not prove drop resistance. An adult can carry out a planned drop test in a safe test area to check whether the case protects the parts.

InvestigateFind strengthsFind weaknessesWrite requirements
Use what you observe and test to plan an improvement.
Try it together

Judge a product against its user's needs. A lunchbox handle that makes carrying comfortable is a strength. A zip that small hands struggle to open is a weakness. Observations or tests help you explain how a feature helps or hinders the user.

A design brief says who an improved product is for and what problem it should solve. Criteria say what it must meet. For a hard-to-open lunchbox, try 'the child can open it with one hand'. 'Nice' needs a clearer meaning before you can check it. You can investigate appearance by asking intended users a specific question about it.

Zip hard to openNeed: easier openingTest: use one hand

Investigate a product, weigh its strengths against its weaknesses, then turn what you found into a brief with clear, testable criteria.

Lesson and assessment material written for this dataset.

2 · Watch

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Take it off screen

Print a worksheetA4 with an answer key page for grown-ups. No screen, no internet.

Where it sits

Where this leads

Jobs that lean on this skill. Follow one to see everything it is built on.

Then practise

8 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.

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Design briefs and better products · Design & Technology, ages 8 to 11 · LightMySky