The big idea: Reverse engineering takes an existing product apart to find out how it works, what it is made of, and — the part that matters — why each decision was taken.
The output is data: numbers, counts and a parts list. Not a set of photographs.
Five stages, each ending in something recorded — and the usability baseline you can only get before you open it.
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| Stage | What you do | What you record |
|---|---|---|
| 1. Use it first | Perform the task the product exists for, before touching a screwdriver | Times, errors, hesitations, hand positions — the usability baseline |
| 2. Test it whole | Measure the performance claims: load, speed, temperature, noise, power, stability | Numbers with conditions — tips at 4 kg placed 80 mm in; 14 s to reposition |
| 3. Dismantle in order | Photograph every step, count fixings and tools, note what must be destroyed to get in | Time to disassemble, tool count, parts damaged — the repairability data |
| 4. Analyse the parts | Identify each component, its material, its process and what it is for | A parts list with material, process and function — and the parts you cannot explain |
| 5. Infer the decisions | Work out why each choice was made — cost, process, assembly time, a standard, a patent | The design rationale, which is what you were really trying to recover |
Use it before you open it: Once a product is in pieces you can never go back and measure how long a first-time user took to complete the task with it.
That baseline is the only evidence of usability you will get, and opening the product first destroys it permanently.
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The statement asks for data that identifies areas needing improvement AND shows how well the product meets user needs. Both halves need measurements, taken against a stated condition.
| What you establish | The question | The data it produces |
|---|---|---|
| Function | Does each part do what it appears to? Which cannot be explained? | A parts list with material, process and purpose for every component |
| Performance | How well, at the limit, in the conditions it actually meets? | Tips at 4 kg placed 80 mm in; 14 s to reposition; 62 dB at 1 m |
| Usability | Can a first-time user finish unaided, and how long does it take? | 6 of 20 unaided; mean 71 s; 3 abandoned at the same step |
| Repairability | How long to open it, with what, and what is destroyed on the way in? | 9 minutes, 3 tools, 2 clips broken — a comparable number |
The part you cannot explain is the interesting one: Every reverse engineering exercise turns up a component whose purpose is not obvious.
It is usually there for a reason you have not thought of — a standard, a patent route, a manufacturing constraint, a failure somebody had years ago. Removing it in a redesign without finding out why is how a known problem is reintroduced.
How this is tested — using data from testing and reverse engineering to identify improvements. It comes up two ways:
Paper 1 — multiple choice
- Identify what stage of reverse engineering produces a stated datum.
- Pick the measurement that establishes usability.
Paper 2 — analysing a product
- Explain how reverse engineering a named product would be carried out.
- Analyse what given test data says about a product.
The trap: Describing taking something apart. Every stage must end in a recorded number or fact, and the usability baseline must be taken BEFORE the product is opened.
Explain how reverse engineering a cordless drill would establish its function, performance and usability.
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