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Request Engineering ReviewEMPB, ISIR and PPAP should not be treated as a universal three-level approval hierarchy. The correct route depends on the customer-specified quality framework, submission form, required evidence and approval rules. Before preparing the package, confirm what the customer actually means by the requested term and which records must be submitted.
Core rule: do not infer approval scope from the acronym alone. If the requirement is unclear, confirm the applicable standard, required form, submission level, approval owner and resubmission rules. Broader validation logic belongs in the injection mold validation and approval guide .
EMPB is commonly used for first-sample inspection and approval reporting in VDA or customer-specific quality environments. It can document conformity to the released drawing and agreed requirements, but the acronym alone does not define one universal submission package.
Confirm the governing requirement before preparing the package. Check the customer manual, specified form or portal, required evidence, approval owner and resubmission rules instead of relying on “EMPB” alone.
ISIR commonly refers to an Initial Sample Inspection Report used to document whether submitted samples conform to defined drawing or customer requirements. In practice, the report may center on dimensional and sample evidence, but its exact contents are normally controlled by the customer’s own quality requirements.
Link the inspected sample to the correct part number, drawing revision, sample or cavity identity and applicable inspection scope.
Record the dimensional or other required results using the customer’s defined format, characteristic list or inspection requirements.
Verify whether the customer expects only an initial-sample report or additional approval records beyond the ISIR itself.
Do not treat “ISIR” as a universal global submission level. The term may describe a customer-required initial-sample report, but the governing specification, required attachments, approval form and resubmission rules must still be confirmed for the individual program.
PPAP is a formal production-part approval process used to show that engineering and customer requirements can be met through the defined manufacturing process under production conditions. The required submission still depends on the customer, submission level and applicable customer-specific requirements.
Once PPAP is confirmed as the required route, use the PPAP Level 3 document list for the customer-defined submitted and retained evidence requirements.
Use this matrix to compare the role of each route, not to rank them as fixed approval levels. The actual submission package must still follow the customer’s applicable standard, specified form, required evidence and approval instructions.
| Decision Point | EMPB | ISIR | PPAP |
|---|---|---|---|
| Primary Approval Question | Do the submitted first samples and required records meet the customer’s defined approval basis? | Do the inspected initial samples conform to the specified drawing or inspection requirements? | Can the defined production process produce parts that satisfy engineering and customer requirements? |
| Typical Framework | Often used in VDA-oriented or customer-specific first-sample approval processes. | Usually a customer-defined initial-sample inspection or reporting requirement. | AIAG-based production-part approval process with customer-specific requirements. |
| Sample Conformity Evidence | Commonly includes controlled sample identity, drawing-linked results and other customer-required first-sample evidence. | Commonly centered on measured initial-sample results and traceable inspection records. | Includes dimensional or part-conformance evidence as part of a broader production approval package. |
| Process Evidence | May be required depending on the governing customer approval process; do not assume one fixed scope. | Not defined by the ISIR name alone; additional process evidence depends on customer requirements. | Process-control, measurement-system or capability evidence may be required according to the submission level and customer. |
| Approval Record | Customer-specific EMPB / first-sample report or approval format. | Customer-defined ISIR form, inspection report or portal record. | Formal customer submission and approval record under the required PPAP route. |
| Customer-Specific Override | Always confirm the required VDA/customer form, evidence fields and release workflow. | Always confirm the customer’s exact report scope, attachments and acceptance method. | Always confirm submission level, customer-specific requirements and required submitted versus retained evidence. |
| Resubmission | Trigger and scope depend on the customer’s approval rules and the nature of the change. | Repeat or partial update depends on affected samples, characteristics and customer instructions. | Resubmission depends on applicable PPAP and customer-specific change / notification requirements. |
Choose the route from the customer requirement, not from the acronym alone. If the project only needs traceable first-article measurement evidence, review the injection molding FAI report . If the customer has formally selected PPAP, use the dedicated PPAP document page rather than expanding the complete PPAP package here.
If the customer only writes “EMPB,” “ISIR” or “PPAP,” do not build the submission package from the acronym alone. Confirm the governing requirement, expected form, evidence scope and approval workflow before inspection or document preparation begins.
Identify the named standard, customer manual or supplier quality requirement that controls the submission.
Confirm whether the customer provides an EMPB form, ISIR sheet, PPAP format or proprietary portal template.
Ask which records must be submitted, retained, uploaded or approved for this specific project.
Confirm which samples, mold cavities or part variants must be represented in the approval evidence.
Determine whether initial samples are enough or whether the customer expects production-representative process evidence.
Identify who reviews and releases the package: buyer, SQE, plant quality, engineering or another customer function.
Verify required upload location, document naming, revision coding and record-format rules before submission.
Confirm any additional dimensional, material, functional, control or traceability records required beyond the named route.
Ask which product, tooling, material, process or site changes require partial or full resubmission.
The safest route is the one explicitly tied to the customer’s documented requirement. If the required form, submission scope or approval owner is unclear, clarify those points before building dimensional layouts, process records or portal packages.
A change does not automatically mean a full resubmission. The correct response depends on what changed, which approved characteristics or process conditions may be affected, and what the customer’s approval rules require. Start with impact review, then define whether no update, a targeted update or a broader resubmission is needed.
| Change Trigger | What to Review | Likely Action | Key Boundary |
|---|---|---|---|
| Drawing or Specification Revision | Identify affected dimensions, materials, functions or approval characteristics. | Targeted or broader update depending on revision impact. | Do not repeat unaffected evidence unless the customer requires it. |
| Tooling or Cavity Modification | Review changed steel, geometry, cavity identity and affected molded characteristics. | Partial / cavity-specific update may be sufficient. | A local cavity repair does not automatically require a complete package rebuild. |
| Material or Approved Source Change | Check whether material specification, performance or traceability basis changes. | Impact review first; update evidence if affected. | Customer notification or approval rules may control the scope. |
| Process, Equipment or Site Transfer | Review whether approved manufacturing conditions, controls or production location have changed. | Broader resubmission may be required when the approved process basis changes. | Scope must follow the applicable customer-specific requirement. |
| Customer-Requested Reapproval | Confirm the stated trigger, required format and evidence requested by the customer. | Follow the defined customer submission scope. | Customer instruction overrides generic route assumptions. |
Use change impact to define scope. Reconfirm the affected part, cavity, characteristic, material, process or site first; then apply the customer’s notification and approval requirement to decide whether the response is targeted, partial or full.
Before accepting a supplier’s claimed EMPB, ISIR or PPAP route, reviewers should confirm that the requirement source, submitted samples, inspection evidence, process evidence and release record all belong to the same controlled approval basis.
Verify the customer manual, specified form, submission level or portal instruction that defines what the supplier is expected to submit.
Confirm that the inspected part number, drawing revision, mold or cavity identity and sample source match the approval record.
Check that dimensional, material, functional or other required results are traceable to the submitted samples and required characteristics.
If the route includes production-process approval, verify that the required process-control or capability records correspond to the approved manufacturing conditions.
Confirm approval status, open deviations, conditional releases, missing records and any action that must be closed before the customer accepts the package.
Do not judge the package by document count alone. A stronger submission is one in which the customer requirement, sample identity, evidence and release decision can be traced without reconstructing the approval history manually.
This updated 4-page engineering reference helps buyers, SQEs and suppliers compare the three approval routes without treating them as a fixed hierarchy. Use it to clarify the required route, evidence scope and resubmission logic before the package is prepared.
No. They should not be treated as a universal three-level hierarchy. The actual submission scope depends on the applicable quality framework, customer-specific requirement, required form and approval instructions.
Confirm the governing standard or customer manual, required form, submission scope, sample or cavity coverage, approval owner and resubmission rules before preparing the package.
Yes. Additional process or production evidence may be required when the customer’s approval procedure calls for it. The acronym alone does not determine the complete evidence package.
No. The change should first be assessed for impact. Customer rules then determine whether the response is a targeted update, partial resubmission or broader reapproval.
If the route is already defined and you need manufacturing support, review our injection molding production support and PPAP, FAI and quality documentation support .
Send the drawing and the customer’s quality requirement, checklist, form or portal instruction. We can help identify which submission route and supporting evidence need to be clarified before the package is prepared.
Include the customer requirement or submission instruction where available.
