Generate distinct ideas and compare them fairly
Use sketches and annotations to explore alternatives, then evaluate each against the specification before selecting a direction.
Section 27-2-IDEA-GENERATION · 2024–2027 · Project · generate and explore ideas
Exam scope and assessment notes
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Before you begin
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
How should a concept comparison matrix be used?
What you will learn
- Generate a range of distinct ideas and communicate them with useful sketches and notes.
- Compare proposals against specification points and justify which parts should be developed.
Create alternatives that solve the same need differently
A useful set explores different structures, mechanisms, materials or ways of interacting with the product. Each sketch should reveal the main form and function; annotations identify materials, construction, movement, dimensions or a feature that needs testing.
Use design strategies to broaden possibilities: change scale, arrangement, material, joining method, user interaction or production process. Keep the brief and specification visible so an imaginative idea still addresses the actual problem.
Compare evidence, not decoration
A comparison table can list each idea against every specification criterion. Use evidence from research or a model where possible; label estimates as estimates. A weighted matrix is useful only if the weights reflect agreed priorities and the scoring is explained.
Do not select solely by a high total. Note safety, feasibility and any criterion that a candidate fails. A promising proposal may combine a feature from another concept, but record why the change improves the solution.
Sources for this lesson
Pause and explain
What makes two design proposals genuinely distinct?
Worked example
Three concepts organise a classroom charging station: a flat tray, a vertical rack and a wall rail. How should a learner compare them?
Show the worked solution
- Sketch all three with the same scale or enough dimensions to compare space.
- List criteria such as capacity, cable access, stability, security and cleaning.
- Score with evidence or mark unknowns that require a model or user check.
- Select a direction and identify the main risk to test next.
Answer The wall rail may save desk space but depend on safe installation; the rack may separate devices but have a larger footprint; the tray may be easy to clean but allow cables to tangle. A decision should follow the actual room constraints and a stability/access test, not appearance alone.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Sketch alternatives for a small desk organiser: one modular, one fold-flat and one fixed compartment design. What should each annotation explain?
Give me a hint
Annotate how it holds objects, fits the desk and can be made.
Compare my reasoning
- Show the outline and a relevant view of each concept.
- Label capacity, access and key dimensions or moving parts.
- State one material or joining idea and one uncertainty per concept.
A useful set would show how each organiser stores the same measured objects, its footprint, how the user retrieves them, and how it folds or assembles. Label the material and a question such as hinge strength or compartment fit for later testing.
Look for these in your work
- Shows distinct concepts
- Communicates function
- Identifies a testable uncertainty
A light shade must direct light downward and allow a bulb to be replaced. Compare a closed dome with a two-part shade using two criteria.
Give me a hint
Think about direction of light and access for maintenance.
Compare my reasoning
- State how each form directs light.
- Compare maintenance access against the same criterion.
- Explain which evidence or model could resolve remaining uncertainty.
A closed dome may control glare but need a removable section to reach the bulb; a two-part shade may improve access but create a visible seam or light leak. Compare both with an illumination sketch or safe mock-up and the actual bulb dimensions.
Look for these in your work
- Compares both designs against common criteria
- Recognises trade-offs
- Proposes evidence for the decision
An early scoring table favours the lightest product, but the user needs it to remain stable outdoors. How should the decision process change?
Give me a hint
Check whether the weighting hides a mandatory safety or function criterion.
Compare my reasoning
- Review the stability requirement and the evidence behind each score.
- Separate minimum pass criteria from preferences.
- Modify, retest or reject proposals that fail stability.
Treat safe stability as a must-meet criterion rather than allowing low mass to compensate for a tipping risk. Recheck scores using evidence, then test a prototype under relevant conditions. The product can be light only if it also remains stable.
Look for these in your work
- Finds a weighting problem
- Prioritises a mandatory criterion
- Uses testing before selection
Common mistakes
- Producing several sketches that differ only in colour
- Scoring ideas without linking scores to criteria
- Ignoring a serious safety or feasibility failure because the total score is high
What can you explain now?
What makes two design proposals genuinely distinct?
Compare with the explanation
They use meaningfully different ways to meet the same need.
Different arrangements, mechanisms or materials can expose different advantages and risks.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Recall the main decision in “Generate distinct ideas and compare them fairly”, name the evidence that supports it, and identify one limitation that still needs checking.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.