Good Learning Co.
SavannahYear 8
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Design & TechnologyEvaluating design and its impact25 min★★ difficulty

Testing and refining against a specification

A design is never finished after the first attempt. Testing against clear criteria — and listening to real users — is how good products get better.

Part of your national curriculum
  • Evaluate: Test, evaluate and refine their ideas and products against a specification, taking into account the views of intended users

Lesson overview

What you'll learn in this lesson

Test, evaluate and refine their ideas and products against a specification, taking into account the views of intended users

Key learning points

  • • Using a specification
  • • Gathering user views
  • • Refining the design

This lesson at a glance

  • 25 minutes
  • 14 parts to scroll through
  • 3 quick checks
  • Marked quiz at the end
  • Gentle pace: short sittings with pauses

Words to know

refineproductsspecificationtakingaccount

Scroll down — the lesson carries on below

Part 1 of 14 · Discover7%
1

Watch & discover

Part 1 of 14

Watch first

Testing and refining against a specification

An English teaching video on this topic from Yi MakesItEasy. Watch it, then scroll down for the lesson.

In a nutshell

Test, evaluate and refine their ideas and products against a specification, taking into account the views of intended users

2

Learning cycle

Part 2 of 14

Learning cycle 1 of 2

Part 1 · Using a specification

A short piece of teaching, then a check to make sure it has landed.

3

Explore the idea

Part 3 of 14

Learn

Using a specification

A specification is a checklist of requirements written before making, such as size limits, cost, or safety features. Testing a finished prototype against each point shows exactly where it succeeds and where it falls short.

4

Explore the idea

Part 4 of 14

Learn

Gathering user views

Watching someone use a product, or asking direct questions, often reveals problems the designer never noticed, such as a handle that is awkward to grip. User feedback should be specific and honest to be genuinely useful.

5

Quick check

Part 5 of 14

Quick check

What is a specification used for?

6

Reset break

Part 6 of 14

Pause

That's sitting 1 of 2 done

Stretch, get a drink, look out of the window. There is no timer and nothing is counting down — your place is saved, so you can come back in five minutes or tomorrow.

Stop here for now
7

Quick check

Part 7 of 14

Quick check

Why gather feedback from intended users?

8

Learning cycle

Part 8 of 14

Learning cycle 2 of 2

Part 2 · Refining the design

A short piece of teaching, then a check to make sure it has landed.

9

Explore the idea

Part 9 of 14

Learn

Refining the design

Refinement means making targeted changes based on testing and feedback, then testing again. This cycle of test–evaluate–improve is repeated until the product reliably meets the specification.

10

Quick check

Part 10 of 14

Quick check

What should happen after refining a design?

11

Challenge round

Part 11 of 14

Game · Sort it

Which of these are true?

Drag each card into the right column. Tap a card first if dragging is fiddly.

True

Not true

12

Challenge round

Part 12 of 14

Game · Fill the gaps

Finish the sentences

Choose the word that belongs in each gap.

A ____ is a checklist of requirements written before making, such as size limits, cost, or safety features.

13

Mastery quiz

Part 13 of 14

Marked quiz

End of lesson quiz: Testing and refining against a specification

3 questions, marked with the reasoning shown. No timer.

  1. 1. What is a specification used for?

  2. 2. Why gather feedback from intended users?

  3. 3. What should happen after refining a design?

14

Lesson round-up

Part 14 of 14

Lesson round-up

Ready when you are

Quiz score

Not sat

Games

Not played

Points this lesson

0

Best run

0 in a row

Luna: 0 out of 3 on the practice checks. Only if you feel up to it — one more?

Ask Luna

Do the work

Your written work for this lesson

This is the part you'd do in your book at school. Pick the pieces below, write here or on paper, and photograph anything you draw or work out.

Report

Why the first prototype broke

A team designed a phone stand from 3 mm plywood. The brief said it must hold a 200 g phone at 60° and survive being knocked. The first prototype looked right but snapped at the joint after two knocks.

The team tested again and found the grain of the plywood ran across the narrowest part of the joint, so the wood split along it. They widened the joint from 8 mm to 20 mm, turned the piece so the grain ran along the load, and added a small fillet at the corner to spread the force.

The second prototype survived twenty knocks. It used 15% more material and took four minutes longer to cut — a trade-off the team recorded in their evaluation.

Written for Good Learning Co.

Reading questions

  1. Name the fault in the first prototype and explain why it happened.
  2. List the three changes the team made and what each one does.
  3. Write an evaluation of the second prototype against the brief, including the trade-off.

  • Design sheet

    Diagram

    Sketch two ideas with measurements and notes, then photograph the sheet.

    2 labelled sketches

  • Evaluation

    Writing

    Write how well your idea meets the brief and what you would change next time.

    6–8 sentences

Saved as you type.

Part 1 of 14 · Watch & discover

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    Test, evaluate and refine their ideas and products against a specification, taking into account the views of intended users

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