Writing a design specification
A specification turns a brief into a checklist of exact, testable requirements — the yardstick against which a finished product is judged.
Part of your national curriculum
- Design: Develop specifications to inform the design of innovative, functional, appealing products that respond to needs in a variety of situations
Lesson overview
What you'll learn in this lesson
Develop specifications to inform the design of innovative, functional, appealing products that respond to needs in a variety of situations
Key learning points
- • From brief to specification
- • Balancing user needs
- • Using the specification to test a product
This lesson at a glance
- 20 minutes
- 17 parts to scroll through
- 3 quick checks
- Marked quiz at the end
- Gentle pace: short sittings with pauses
Words to know
Scroll down — the lesson carries on below
Watch & discover
Part 1 of 17
Visual introductionPicture this
Writing a design specification
A specification turns a brief into a checklist of exact, testable requirements — the yardstick against which a finished product is judged.
In a nutshell
Develop specifications to inform the design of innovative, functional, appealing products that respond to needs in a variety of situations
Learning cycle
Part 2 of 17
Learning cycle 1 of 2
Part 1 · From brief to specification
A short piece of teaching, then a check to make sure it has landed.
Explore the idea
Part 3 of 17
Learn
From brief to specification
While a brief is a general statement of the problem, a specification lists specific, measurable requirements: for example, 'must weigh under 200g', 'must cost less than £5 to make' or 'must be waterproof for at least 10 minutes'. Vague terms like 'must look nice' are replaced with something you can actually test.
Reset break
Part 4 of 17
Pause
That's sitting 1 of 4 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.
Explore the idea
Part 5 of 17
Learn
Balancing user needs
Specifications should reflect real user needs gathered through research, such as surveys or interviews, not just the designer's own preferences. A specification for a school bag, for instance, might specify strap width for comfort, based on what students said felt uncomfortable in existing bags.
Quick check
Part 6 of 17
Quick check
What makes a good specification point, compared with a vague brief statement?
Quick check
Part 7 of 17
Reset break
Part 8 of 17
Pause
That's sitting 2 of 4 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.
Learning cycle
Part 9 of 17
Learning cycle 2 of 2
Part 2 · Using the specification to test a product
A short piece of teaching, then a check to make sure it has landed.
Explore the idea
Part 10 of 17
Learn
Using the specification to test a product
Once a prototype exists, each specification point becomes a test: does it meet the weight limit? Does it survive the drop test? A good specification means evaluation is not just opinion — it is checking against agreed, specific criteria.
Quick check
Part 11 of 17
Reset break
Part 12 of 17
Pause
That's sitting 3 of 4 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.
Challenge round
Part 13 of 17
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
Challenge round
Part 14 of 17
Game · Fill the gaps
Finish the sentences
Choose the word that belongs in each gap.
____ should reflect real user needs gathered through research, such as surveys or interviews, not just the designer's own preferences.
Challenge round
Part 15 of 17
Game · Recall cards
Which is the most useful design specification point?
Card 1 of 4
Mastery quiz
Part 16 of 17
Marked quiz
End of lesson quiz: Writing a design specification
4 questions, marked with the reasoning shown. No timer.
1. Which is the most useful design specification point?
2. What makes a good specification point, compared with a vague brief statement?
3. Where should specification requirements ideally come from?
4. Which is an example of a testable specification point?
Lesson round-up
Part 17 of 17
Lesson round-up
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Develop specifications to inform the design of innovative, functional, appealing products that respond to needs in a variety of situations