Project context
Industrial products rarely fail because nobody worked hard. They fail because one team believed a requirement was settled while another team treated it as provisional. A drawing can be released while the seal interface is still changing, a sample can look acceptable while the measurement method is undefined, or purchased components can arrive after the assembly fixture has already been built. Evidence gates create a shared pause point. They connect the commercial promise, product definition, manufacturing route and approval record so that a buyer can see what is known, what remains open and who owns the next decision.
Gate 1: requirements and decision ownership
The first gate confirms the product use, target market, forecast, critical interfaces, appearance expectations, compliance inputs and the person authorized to approve change. The useful evidence is concise: a controlled brief, current drawings or CAD, a bill of materials at the available maturity, and a list of assumptions. Unknowns are not a reason to stop the project, but they must be labeled. A working assumption about resin, ingress protection or service load cannot quietly become a production specification simply because it appeared in an early quotation.
This gate also separates product requirements from supplier preferences. A preferred material or process may be a sensible starting point, yet the requirement should describe the function it protects. That distinction lets engineering compare alternatives without losing the buyer’s intent. Release is appropriate when scope, interfaces, quantities, evidence expectations and decision owners are visible. If a critical requirement has no owner or acceptance method, the program remains in discovery even when commercial activity has already started.
Gate 2: design and DFM closure
The second gate checks whether geometry, tolerance, material, finish and assembly interfaces are suitable for the selected processes. DFM evidence should identify specific risks and the requirement behind each recommendation. For a molded enclosure, that may include draft, wall transitions, bosses, parting lines and seal lands. For sheet metal, it may include bend relationships, hardware access and coating allowance. For an assembled system, it includes cable routing, purchased components, fixtures and service access. A generic DFM approval is not enough when several suppliers control connected interfaces.
A controlled design package records accepted changes and unresolved exceptions. Redlines, meeting screenshots and informal messages can support discussion, but the released model and drawing remain the authority. The gate closes when revision identifiers match across the buyer, Pauline and the relevant manufacturers; critical characteristics have an inspection approach; and any intentional deviation has a named approver. This prevents a technically useful prototype from being mistaken for permission to reproduce every provisional feature at production volume.
Gate 3: process and capability evidence
The third gate demonstrates that the chosen tooling, equipment, process window and inspection resources can repeatedly create the required result. Evidence depends on risk. It can include tool-trial records, machine and cavity identification, material certificates, dimensional reports, gauge studies, fixture checks, appearance references or functional tests. The purpose is not to collect documents for their own sake. Each record should answer a release question: can this process control the features that matter, and will the same method be available when regular production begins?
Capability evidence should reflect the real production route, not an ideal laboratory path that will not be repeated. If pilot parts use a different resin, machine, coating supplier or manual operation, that difference belongs in the release record. Corrective action must identify whether the cause is design, tooling, process, material, measurement or handling. Closing the gate means the team has an agreed window and reaction plan, not merely that one set of parts happened to pass inspection.
Gate 4: sample and reference approval
The fourth gate turns a successful sample into a controlled reference. Approval should state which revision, material, color, texture, supplier components and test conditions were reviewed. Dimensional approval and cosmetic approval may require different evidence and different owners. Where a physical boundary sample is used, storage, identification and replacement rules matter. A photograph can help communication but rarely captures gloss, texture, fit or tactile expectations well enough to serve as the only production reference.
Conditional approval is valid when the conditions are explicit. A buyer might approve geometry while waiting for final color, or authorize a limited build while one documentation item is completed. The quantity, expiry and containment action should be recorded. That discipline protects schedule without converting a temporary concession into a permanent specification. The gate closes when both supplier and buyer can identify the same approved state and understand how production output will be compared with it.
Gates 5 and 6: supply readiness and production release
The fifth gate checks the complete supply and assembly route. Purchased parts, inserts, seals, labels, packaging and subassemblies need approved sources, incoming checks and timing that supports the build sequence. Work instructions and fixtures should reflect the released product, while traceability should be proportionate to technical and commercial risk. This is where a program often discovers that individually acceptable parts do not create an acceptable product. A controlled pilot build exposes interface, handling, takt and test problems before normal output commitments begin.
The sixth gate is the formal production release. The release package identifies current files, approved references, open deviations, control plans, packaging, quantities, delivery requirements and change authority. It also defines what happens when output moves outside the approved condition. Pauline’s role is to connect this evidence across engineering, tooling, component suppliers, assembly and buyer approval. A clear release does not eliminate future change; it establishes the baseline from which every change can be evaluated, costed, tested and approved without losing accountability.