Testing Design Solutions

Overview

This theory lesson is 15 of 18 in Design, Model and Make. Students learn how to test a design fairly against clear criteria and plan reliable user feedback before improving their jewellery, CAD, textiles or STEM solutions.

Learning intentions

Students will:

• explain why design testing needs clear criteria and reliable evidence
• plan tests for functionality, usability, aesthetics, safety and sustainability
• distinguish useful evidence from opinions or unsupported assumptions
• use user feedback to identify a justified improvement

Success criteria

• I can write a measurable test for at least four design criteria.
• I can identify what evidence a test should collect.
• I can explain how to make user feedback fair and reliable.
• I can recommend an improvement using test evidence.

Curriculum links

• Develop independent design criteria, including sustainability, to evaluate design ideas, processes and solutions.
• Analyse needs and opportunities and develop design briefs for intended users.
• Generate, test, iterate and communicate design ideas, including through digital tools.
• Select and justify suitable technologies, materials, processes and safety procedures.

Lesson structure (60 minutes)

1. 0–5 min · Hook and retrieval. Display a photograph of two similar student-designed products and ask, “How can we prove which design is better?” using the opening comparison slide. Students write one possible test and recall the difference between a design criterion and a design preference.

2. 5–15 min · Direct teaching: criteria and evidence. Use the criteria and evidence slides to model the difference between a vague criterion, such as “looks good”, and a measurable criterion, such as “eight out of ten target users rate the appearance at least four out of five”. Introduce the five test areas: functionality, usability, aesthetics, safety and sustainability. Students classify sample evidence as measurable evidence, user feedback or unsupported opinion.

3. 15–25 min · Modelling a reliable test. Demonstrate a simple test for a wearable jewellery clasp or textile fastening. Think aloud while identifying the purpose, variables, procedure, participants, recording method and success threshold. Emphasise changing one factor at a time, using the same instructions for each tester, collecting evidence from more than one user and respecting privacy and safety. Students help improve a deliberately unreliable test, recording suggestions on the design testing and evidence worksheet.

4. 25–43 min · Individual test-planning task. Distribute the design testing and evidence worksheet and direct students to select their current project or a provided design scenario. They write one criterion and a planned test for each of at least four areas. For every test, students record: what will be tested, who or what will provide evidence, the procedure, the evidence to collect, the success threshold and one safety or sustainability consideration. Students may refer to the prototype testing feedback template for the structure of a formal criterion-based test and action plan.

5. 43–53 min · Peer critique and revision. Students work in pairs to review plans using the prompts on the peer-review and discussion slides: “Is the test fair?”, “What evidence will prove the criterion was met?”, “Could the result be repeated?” and “Does it consider safety and sustainability?” Partners give one specific strength and one improvement. Students revise at least one test and highlight the change on their worksheet.

6. 53–60 min · Plenary and exit check. Return to the plenary slides and ask students to share examples of strong evidence. Students complete the final worksheet prompt: “The most important improvement to my testing plan is … because …”. Invite two or three responses, then collect worksheets to inform the practical testing session.

Resources

• Teacher computer and display
• the testing, evidence and peer-review slide deck
• the design testing and evidence worksheet
• the prototype testing feedback template
• Current student design briefs or project sketches
• Sample jewellery clasp, textile fastening or small prototype
• Pens, highlighters and rulers
• Timer
• Whiteboard and markers

Assessment

• During classification, question students to check whether they can distinguish evidence from opinion and identify measurable criteria.
• Check worksheets while students plan: each test should include a clear procedure, evidence type, success threshold, and safety or sustainability consideration.
• Use the revised test and final sentence as an exit check. Identify students needing support before the next practical lesson.

Differentiation

• Provide sentence starters: “To test whether the design can …”, “I will measure … by …”, “The criterion is met if …” and “This evidence is reliable because …”.
• Allow students to plan from a familiar project example before applying the process to their own design. Read instructions aloud and provide a completed sample for reference.
• Support EAL/D students with a visual five-area checklist and paired discussion before writing; accept labelled diagrams or bullet points alongside full sentences.
• Extend confident students by requiring a repeatable test with numerical data, a second user group or a comparison between two design options. Ask them to identify one possible source of bias and how to reduce it.