Give each build a purpose
An engineering prototype may test a circuit concept. A pilot should test the intended production method, documentation and test coverage. Define the questions the build must answer before deciding its quantity or acceptance criteria. Do not call a build successful simply because some working units were delivered.
Track open issues to closure
Maintain a shared list of design, material, process and test issues. Each entry should have a severity, owner, due date and disposition. Separate changes required before production from improvements planned for a later revision. The release decision should make unresolved risk visible.
Release documents as a set
The product BOM, fabrication files, placement data, assembly notes, firmware and test procedure should be released together. A revision matrix helps prevent parts ordered to one version from being assembled to another. Establish the point after which a change requires impact review.
Demonstrate production readiness
Confirm material availability, manufacturing instructions, inspection criteria, test fixtures, trained personnel and required records. Review pilot results and discrepancies against the original objectives. Production approval should identify the approved revision and any bounded exceptions.
At a glance
| BUILD | MAIN QUESTION | EXIT EVIDENCE |
|---|---|---|
| Prototype | Does the design perform as intended? | Design findings and next revision |
| Pilot | Can the intended process build it consistently? | Process findings and issue closure |
| Production | Can released requirements be maintained? | Controlled build and acceptance records |
| Change build | Does the change preserve required behavior? | Impact assessment and verification |
A practical checklist
- Name the objective of each build.
- Maintain a controlled revision matrix.
- Assign owners to unresolved issues.
- Define pilot acceptance before building.
- Confirm fixtures and test instructions.
- Record who authorizes production release.
Assign an owner to each open item and keep the decision with the project revision. A checked box should point to a document, approval or piece of evidence; it should not simply indicate that a topic was discussed.
A common mistake to avoid
Moving straight from a hand-built prototype into a large order. A working design can still need process validation, fixture development or documentation changes before it can be manufactured consistently.
Put the guidance to work
Start with the RFQ preparation checklist, keep component information in the BOM template, and compare evidence using the supplier scorecard. Confirm project-specific requirements with your design team and manufacturing partner.
Explore the related manufacturing scope or return to the NPI & Prototyping guide hub.