A sound product sketch starts with what someone actually does, not with the product. You observe, turn the struggle into a need, and then show which feature answers that need.
This lesson belongs to SPM subjects and learning resources. When you have several ideas, move on to comparing alternatives with functional criteria.
What counts as an observation?
An observation is something you saw or heard, written without judgement. “Aunty holds the tin with her left hand and pulls the lid with her right, then the tin slips” is an observation. “Tin lids are bad” is an opinion.
Write three to five observations before you decide on any solution.
Worked example: an invented kitchen tool
The learner watches a grandmother open a screw-top jar of sambal. Notes: she wraps a cloth around the lid, grips with both hands, and the jar slides on the wet counter. She stops twice to rest her wrists.
From the notes, the learner writes a need: “Open a tight jar lid using less grip force, without the jar sliding.”
| Observation | Need | Sketch feature |
|---|---|---|
| Wraps a cloth around the lid | Better grip on a smooth lid | Rubber-lined ring that clamps around the lid |
| Jar slides on the wet counter | Jar must stay still | Non-slip base pad under the jar |
| Stops to rest wrists | Less squeezing force | Long handle on the ring, so a push turns the lid |
Each feature in the sketch can be traced back to a line in the notes. A reader can check whether the feature truly answers the need.
The mistake to avoid
The common slip is to begin with a product and invent a user: “a smart jar opener with a digital display”. Nobody in the notes asked for a display.
If a feature has no observation behind it, cut it or go and observe more. Extra features also make the sketch harder to justify.
Show the link on the sketch
Label each feature with a short note and a number pointing to the matching observation. Keep the notes to a line each.
For the jar opener, “1: rubber ring, replaces cloth” sits beside the ring. Numbered labels give the reader a path from the picture to the evidence.
Check yourself
A learner observes a primary pupil whose pencil case spills when the zip is pulled halfway, and who then searches for pens on a crowded desk. State one need and one sketch feature that answers it.
Answer
Need: keep pens in place and easy to see when the case is opened. Feature: a case that opens flat with elastic loops holding each pen, so nothing spills and everything is visible at once.
Another valid answer might be a stand-up case. The test is that the feature answers something the observation showed.
What to study next
Check your observation-need-feature chain with the structured-answer self-review tool. For a teacher to go through your notes and sketch, see online one-to-one Industrial Design tuition.