Process guide
The new product introduction process.
New product introduction, or NPI, is the structured handoff from a finished design to a shipping product. It is the part of hardware development where the design stops being a drawing and starts being a process. This is how the stages run, and what each one proves.
Why it matters
NPI is where a design becomes a process.
A finished design is a set of decisions about the product. NPI is the set of decisions about how the product is built repeatably, at volume, to specification. Skipping NPI stages does not remove the questions, it moves them into mass production, where they are more expensive and harder to trace.
Each stage produces the evidence for the next.
The DFM review informs the tooling. The first article proves the tooling. The pilot run proves the line. The certification evidence is compiled from all of them. NPI run without that trail produces a product that ships but cannot prove it was built right, which is a liability, not a launch.
The stages
Six NPI stages from design freeze to shipping product
The stages gate each other. Each one answers a question and produces the evidence the next stage depends on. The order is not a preference, it is the sequence that keeps cost and risk bounded.
- 01
Design freeze and DFM
THE LAST POINT WHERE CHANGES ARE CHEAP
Design freeze is the moment the geometry, the bill of materials and the specifications are locked against the manufacturing process. A design for manufacturability review runs here, because this is the last point where a wall thickness, a draft angle or a tolerance change is a drawing revision rather than a tool modification. Freezing before DFM is settled freezes the cost of rework into the program.
- 02
Tooling and fixtures
THE ONE TIME INVESTMENT THAT DECIDES UNIT PRICE
Tooling is cut to the frozen design: moulds for plastic parts, stamping dies for metal, fixtures for assembly and inspection. Tooling cost is a function of complexity, cavity count and steel choice, and it is amortised across volume. A change after tooling exists means re cutting steel, which is why the freeze gate exists. The fixture set, test jigs and inspection datums are scoped here too.
- 03
First article inspection
THE PART THAT PROVES THE PROCESS
The first article is the first part made on the production tooling, inspected in full against the drawing. It proves the tool, the process and the setup produce a conforming part. A first article that fails means the process is not settled, and production will inherit the failure until it is fixed. This is the gate between tooling and a production run.
- 04
Pilot run
SMALL BATCH, FULL PROCESS, REAL LINE
A pilot run, often 50 to 500 units, runs the full production line at small scale. It surfaces the assembly, yield and process problems that a single first article cannot, because it tests the line, the operators and the inspection plan under load. The pilot run is where the process becomes repeatable, and where unit cost stabilises before mass production commits.
- 05
Mass production and quality control
SCALE, WITH THE EVIDENCE TO PROVE IT
Mass production runs the settled process at volume, with incoming inspection, in process checks and outgoing quality control holding the yield and the specification. The documentation from NPI, the frozen design, the tooling records, the first article report and the pilot run data, is what makes the line auditable. A product that ships without that trail cannot prove it was built right.
- 06
Packaging, certification and export
WHAT GETS IT OUT THE DOOR
Retail packaging, final certification submission, labelling and export documentation close the NPI loop. Certification evidence, CE, FCC, UKCA and any sector regime, is compiled from the test reports and design records produced across the stages. Export depends on correct harmonised codes, country specific compliance and packaging that survives transit. NPI is not finished until the product ships and the records prove it was built to spec.
Quick checklist
What a clean NPI handoff looks like
- Design frozen, with a DFM review completed before tooling is quoted.
- Tooling scoped to expected volume, with cavity count and steel choice justified.
- Fixtures, test jigs and inspection datums defined before the first article.
- First article inspected in full against the drawing, with discrepancies closed.
- Pilot run completed at the intended line, with yield and process problems logged.
- Mass production process documented, with incoming and outgoing QC defined.
- Certification evidence compiled from test reports, not re run at the end.
- Export and packaging requirements confirmed before the first shipment.
Common mistakes
Three patterns that break an NPI program
Starting tooling before the design is frozen.
Tooling cut to an unsettled design is a commitment to rework. Every change after steel is cut is a tool modification, a schedule slip and a batch of parts that cannot ship. The freeze gate exists to make the design settled before the tool exists, not after.
Skipping the pilot run to save time.
Going from first article straight to mass production skips the step that surfaces line and yield problems under load. The cost of a mass production run that fails on the line is far higher than a pilot run that catches the same problem at 100 units. The pilot run is the cheapest insurance in NPI.
Leaving certification to the end.
Certification is not a final test, it is a body of evidence built across the stages. Test samples come from the engineering prototype, evidence from the first article, documentation from the pilot run. Treating it as a closing task means re running tests, re building samples and re cutting tooling when a product fails.
FAQ
What founders ask about the NPI process
What is the new product introduction process?
New product introduction, or NPI, is the sequence of stages that takes a hardware product from a signed off design to a shipping, mass produced product. It covers design freeze and design for manufacturability, tooling and fixtures, first article inspection, a pilot run, mass production with quality control, and packaging, certification and export. Each stage gates the next, and each produces the evidence the later stages and the customer depend on.
What does NPI stand for in manufacturing?
NPI stands for new product introduction. In manufacturing it refers to the structured process of moving a product from a finished design into repeatable production. It is sometimes called NPD, new product development, though NPI specifically covers the handoff from design to production rather than the design work itself.
What is the difference between NPI and prototyping?
Prototyping answers design questions: does it work, does it fit, does it look right. NPI answers production questions: can it be built repeatably, at volume, to specification, with inspection and traceability. Prototyping happens before design freeze. NPI starts at design freeze and runs through to shipping product. A prototype is evidence about the design, an NPI first article is evidence about the process.
What is a first article inspection?
First article inspection is the full dimensional and functional check of the first part produced on the production tooling, measured against the drawing. It proves the tool, the process and the setup produce a conforming part. It is the gate between tooling and a production run, because a first article that fails means the process is not settled and mass production will inherit the failure.
Why run a pilot run before mass production?
A pilot run, typically 50 to 500 units, runs the full production line at small scale. It surfaces the assembly, yield and process problems that a single first article cannot, because it tests the line, the operators and the inspection plan under load. The cost of catching a problem at 100 units is a fraction of catching it in a full mass production run, which is why the pilot run is the cheapest insurance in the process.
How long does the NPI process take?
From design freeze to first shipment, a mid complexity consumer product typically takes 12 to 24 weeks. Tooling alone is four to ten weeks. First article inspection adds one to two weeks. A pilot run adds two to four weeks. Certification and export documentation overlap but can add four to eight weeks if test samples are not ready. The timeline is set by tooling complexity and certification, which is why both are scoped during the audit.
When does certification happen in NPI?
Certification evidence is built across the stages, not tested at the end. Test samples come from the engineering prototype, EMC and safety tests run against the first article, and the documentation is compiled from the pilot run records. Treating certification as a final step means re running tests and re building samples when a product fails. Identifying the certification regime during the audit keeps the evidence on the critical path instead of behind it.
A guide maps the stages. An audit runs them on your design.
The Production Readiness Audit puts an engineer on your actual files and returns a written report with the NPI scope, the tooling decisions, the certification path and a clear verdict. If the answer is no, you get the changes that turn it into a yes.
Get your design reviewed