How to write a manufacturer brief without hiding unknowns.
A useful brief does not need to pretend the product is finished. It needs to make the boundary between known and unknown unmistakable.
1. Confirmed definition
List only values supported well enough to be used as the current specification.
2. Founder decisions
Keep commercial and product choices with the founder instead of asking the manufacturer to define the product strategy.
3. Supplier and engineering questions
Ask for proposals where manufacturing knowledge or engineering judgement is genuinely required.
4. Validation
Keep test, safety and compliance requirements separate from mere statements of intent.
5. References
Make drawings, images and documents traceable to the requirements they support.
A worked example: laptop-stand hinge
This fictional example follows one requirement all the way from a note to a supplier handoff.
- Evidence: the founder note says “adjustable viewing angle.” It does not state a hinge torque, service life or test method.
- Requirement R-05: the hinge must retain the chosen angle under the intended laptop load.
- State: Partial. The intended behavior is clear; the mechanism and acceptance criteria are not.
- Owner: engineer, with supplier input. A founder can choose the desired experience but cannot certify the hinge.
- Open question: which hinge architecture and test method will support the load target?
- Decision: request a supplier proposal. Keep the requirement partial when the supplier offers a design; a proposal is not a completed test.
- Output: include the current intent, proposed approach, source of that proposal and remaining validation in the manufacturer brief.
A useful trace reads: Founder note → R-05 → supplier proposal → engineering review → test evidence. Every step should retain its source and owner.