Plan a product for repeatable production
Distinguish models, prototypes and marketable products, then design and improve a suitable production system.
Section Paper 3 · A Level written paper · Topics 13–18 plus AS knowledge
This lesson is original StudyForA learning support aligned to Cambridge International AS & A Level Design & Technology 9705. It is not Cambridge material or an official mark scheme. Practical activity must follow the learner's centre procedures and trained supervision.
Before you begin
- Read the product brief and identify its intended user and context.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What should a manufacturing specification make clear?
What you will learn
- 9705 T15 model prototype product
- 9705 T15 production scales
- 9705 T15 industrial systems
- 9705 T15 system evaluation
Design for the required volume
A model explores form or an idea, a prototype tests aspects of a design, and a marketable product is intended for sale and must meet relevant user and compliance requirements. A design brief for a commercial product needs a target user, purpose and constraints.
A manufacturing specification should give consistent parts, materials, dimensions, processes and quality requirements. Individual, batch and mass production differ in equipment, setup, flexibility, skill, quantity, cost and effects on workers and resources.
Organise, measure and improve the system
Industrial systems include concurrent engineering, computer-integrated manufacturing and engineering, cell production, in-line assembly, just-in-time supply and logistics. Jigs, formers and templates can improve repeatability when their design and use are appropriate.
Evaluate a production system using measures such as cycle time, yield, defects, cost, safety and material use. Continuous improvement, including Kaizen, uses small measured changes. A system is not improved if speed rises while quality or safety falls.
Sources for this lesson
Pause and explain
Which principle best supports this lesson: plan a product for repeatable production?
Worked example
A workshop produces 500 identical clips each month. Would individual, batch or mass production be a reasonable starting point? Explain what to check.
Show the worked solution
- Estimate monthly demand and variation.
- Compare setup and unit cost across production scales.
- Check quality, labour, equipment, inventory and safety before selecting a system.
Answer Batch production may be a starting point if demand is steady but not large enough to justify a dedicated line. A jig can help repeat positioning. Use actual demand, setup cost, unit cost, defect data and available staff before recommending a system.
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.
A batch of 100 wooden handles varies in diameter. Suggest how a jig or former could help, and how to verify the result.
Give me a hint
Use the jig to control a repeated operation, then measure a representative sample or all critical parts.
Compare my reasoning
- Identify the operation and dimension that vary.
- Design a safe jig or former that locates the work consistently.
- Measure output and compare variation, time and safety before and after.
A jig can locate each handle at the same position for shaping or drilling. Measure the relevant diameter with a suitable instrument and record variation before and after. A jig improves consistency only if it is designed, maintained and used safely.
Look for these in your work
- Targets the source of variation
- Matches jig to task
- Plans before/after measurement
A product demand changes sharply by season. Compare just-in-time supply with holding a larger stock.
Give me a hint
Include inventory, supplier reliability, storage, lead times and waste risk.
Compare my reasoning
- Estimate seasonal demand and supplier lead time.
- Compare inventory cost and stockout risk under both approaches.
- Include supplier reliability, storage conditions and product obsolescence.
Just-in-time can reduce inventory and storage cost but depends on reliable suppliers and delivery. Larger stock can buffer peaks but ties up money and may become obsolete or damaged. Use seasonal demand and lead-time evidence to determine a suitable balance.
Look for these in your work
- Explains both systems
- Uses time and supplier evidence
- Recognises trade-offs
A line produces more units per hour after a speed increase, but rejects also rise. Has productivity improved?
Give me a hint
Define useful output and compare quality, waste, safety and cost as well as gross output.
Compare my reasoning
- Compare acceptable units per hour, not only total units.
- Calculate reject rate and material or rework cost.
- Check worker safety and downstream effects before deciding.
Not necessarily. If rejects and rework rise, acceptable output may stay the same or fall and resource use may increase. Compare good units per hour, defect rate, cost and safety against a baseline before calling the change an improvement.
Look for these in your work
- Defines useful output
- Includes defects and resources
- Uses a baseline
Common mistakes
- Calling a model a finished marketable product
- Assuming mass production is always cheapest overall
- Measuring speed without checking defects or worker safety
What can you explain now?
What should a manufacturing specification make clear?
Compare with the explanation
The repeatable materials, dimensions, processes and quality requirements
A production specification must allow consistent manufacture and verification, not just show appearance.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Compare a prototype, a marketable product and a manufacturing specification in one sentence each.
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.