Verification vs Validation
Quality & Inspection Standards
PRODUCTS CENTER
Get Custom Quote
PRODUCTS CENTER
Verification vs Validation
Verification and Validation are two distinct but complementary activities in GJB9001C design and development control. While both are essential for ensuring product quality and mission success, they serve fundamentally different purposes, occur at different stages of the product lifecycle, and use different methods.
Verification answers the question: "Did we build the product right?" It ensures that design outputs meet design inputs — that the product conforms to its specifications. Validation answers the question: "Did we build the right product?" It ensures that the product meets the intended use requirements — that it will perform its mission when it matters.
Engineering Summary
- Verification ensures design outputs meet design inputs — "Did we build it right?"
- Validation ensures the product meets intended use requirements — "Did we build the right thing?"
- Verification is a theoretical exercise (document review, analysis, inspection).
- Validation is a practical exercise (testing, demonstration, operational evaluation).
- GJB9001C requires both Verification (8.3.4.c) and Validation (8.3.4.d) in design and development control.
- Both are mandatory under GJB9001C and serve different purposes in the design process.
Core Definitions
Verification — GJB9001C Definition
Under GJB9001C-2017 Clause 8.3.4, verification is defined through its purpose:
"Implementation of verification activities to ensure that design and development outputs meet input requirements."
Verification is a comparative activity. It takes design inputs — specifications, regulations, customer requirements, and other information necessary for proper function — and compares them to design outputs such as drawings, assembly instructions, test instructions, and electronic design files.
Verification is often described as a theoretical exercise — it verifies that the design has addressed every requirement without necessarily building or testing the physical product. The verification review is typically recorded in a Statement of Compliance or similar document that lists every requirement, identifies whether the design is compliant, and references where compliance is demonstrated.
Validation — GJB9001C Definition
Under GJB9001C-2017 Clause 8.3.4, validation is defined through its purpose:
"Implementation of validation activities to ensure that the resulting products and services can meet specified use requirements or intended applications."
Validation is a demonstration activity. It involves building a version of the product — which may be an engineering model, a first production unit, or a representative sample — and testing it to ensure it meets all necessary requirements defined in the design inputs.
Validation is a practical exercise — it proves that the product, as built, will function to meet the requirements.[reference:12] It often requires more extensive testing than production verification, and in some industries is referred to as First Article Inspection (FAI), first off, or Production Part Approval Process (PPAP).
Key Differences
| Aspect | Verification | Validation |
|---|---|---|
| Core Question | "Did we build it right?" | "Did we build the right thing?" |
| Definition | Ensures design outputs meet input requirements | Ensures product meets specified use or intended application |
| Nature | Theoretical — document and analysis based | Practical — testing and demonstration based |
| Object | Design outputs (drawings, specifications, instructions) | Physical product or representative sample |
| Methods | Document review, analysis, inspection, calculation, simulation | Testing, demonstration, operational evaluation, field trials |
| Timing | During design and development, before physical production | After physical product is available, before full production release |
| Perspective | Developer's perspective — technical correctness | User's perspective — fitness for purpose |
| GJB9001C Clause | 8.3.4.c | 8.3.4.d |
GJB9001C Requirements for Verification and Validation
GJB9001C-2017 Clause 8.3.4 (Design and Development Control) requires organizations to establish and maintain design and development processes that include both verification and validation activities.
The specific requirements are:
- Verification (8.3.4.c): Organizations must "implement verification activities to ensure that design and development outputs meet input requirements."
- Validation (8.3.4.d): Organizations must "implement validation activities to ensure that the resulting products and services can meet specified use requirements or intended applications."
- Records: Organizations must retain documented information of these activities.
- Customer Involvement: Organizations must invite customers to participate in design and development validation, and inform customers of conclusions and results of verification and validation.
The standard's note clarifies that: "Design and development review, verification, and validation have different purposes. Depending on the organization's specific products and services, they may be conducted individually or in any combination."
Verification and Validation in the Design Process
Verification and Validation serve different functions in the design process and occur at different stages:
| Stage | Activity | Verification | Validation |
|---|---|---|---|
| Requirements Definition | Review and approval of design inputs | Check completeness and clarity | — |
| Design Development | Creation of design outputs (drawings, specifications) | Compare outputs to inputs | — |
| Design Review | Evaluate design results against requirements | Confirm requirements addressed | — |
| Prototype Build | Produce representative product | — | Build validation unit |
| Testing | Conduct verification and validation tests | Functional and electrical testing against specifications | Operational and environmental testing against use requirements |
| Qualification | Complete formal qualification | Verify all specifications met | Demonstrate mission capability |
Verification and Validation in PCB Manufacturing
For PCB and PCBA manufacturers, the distinction between verification and validation has practical implications across the product lifecycle:
| Activity | Verification | Validation |
|---|---|---|
| Design | DFM review, design rule checking, signal integrity simulation, compare design outputs to customer requirements | Build prototype boards, test against intended application, confirm fit and function |
| Material Selection | Verify material specifications against IPC-4101 requirements | Validate material performance in actual PCB fabrication and assembly |
| Production | In-process inspection, SPC, 100% inspection of critical characteristics, compare results to specifications | First article inspection (FAI) per GJB 908, process validation for key processes, production readiness review |
| Testing | Electrical testing, visual inspection per IPC-A-600, dimensional measurement, compare to IPC-6012 requirements | Qualification testing per IPC-6012, thermal cycling, vibration testing, HALT, environmental testing per IPC-TM-650 |
| Customer Acceptance | Provide inspection records and test reports demonstrating conformance | Customer acceptance testing, qualification demonstration, first article inspection report |
For PCB manufacturers, verification answers: "Does this PCB meet IPC-6012 requirements?" through inspection and testing. Validation answers: "Will this PCB survive the mission?" through qualification testing, environmental testing, and operational demonstration.
Process Validation vs Product Verification
GJB9001C makes a specific distinction between process validation and product verification:
- Process Validation applies to processes where the output cannot be verified by subsequent monitoring or measurement. These are processes where the product's quality is assured through process parameter control rather than inspection.
- Examples in PCB manufacturing: welding, bonding, vulcanization, heat treatment, surface coating.
- Product Verification applies to processes where the output can be verified through inspection and testing. The product's quality is assured through verification at appropriate stages.
For key processes that cannot be fully verified by inspection — such as plating adhesion, lamination integrity, or solder joint quality — organizations must perform process validation to demonstrate that the process consistently produces acceptable results.
Software Verification and Validation
GJB9001C explicitly addresses software verification and validation in the note to Clause 8.3.4:
"Computer software verification and validation, including analysis, evaluation, review, inspection, assessment, and testing of software processes, ensure that intended applications and user needs are satisfied."
Software verification and validation are particularly important for military PCB programs where embedded software controls critical functions. Software verification ensures code meets specifications; software validation ensures the software performs its intended function in the operational environment.
Verification, Validation, and IPC Standards
IPC standards use both verification and validation concepts:
- IPC-6012 is titled "Qualification and Performance Specification for Rigid Printed Boards" — the qualification aspect is validation (demonstrating the board meets intended use requirements), while the performance specification defines the verification criteria.
- IPC-A-600 provides the visual and dimensional criteria for verification — checking that boards meet acceptability requirements.
- IPC-TM-650 provides the test methods used for both verification (production inspection) and validation (qualification testing).
- IPC's Validation Services Program provides third-party validation that manufacturers meet IPC standards — this is validation of the manufacturer's capability.
Common Misunderstandings
Verification and Validation are NOT:
- Interchangeable — they address different questions and use different methods.
- Verification guarantees validation — a product can meet all specifications (verification) but fail in the field (validation failure).
- Validation is just more testing — validation requires testing against use requirements and intended applications, not just specifications.
- One can replace the other — both are required by GJB9001C.
- Optional for military products — GJB9001C explicitly requires both verification and validation activities.
- Limited to design and development — verification and validation concepts apply throughout the product lifecycle.
Correct interpretation: Verification ensures the product is built according to specifications. Validation ensures the product will perform its intended mission. Both are essential, and neither can substitute for the other.
Verification and Validation in the Product Lifecycle
The distinction between verification and validation applies across the entire product lifecycle:
| Lifecycle Phase | Verification Activities | Validation Activities |
|---|---|---|
| Concept & Requirements | Review requirements for completeness and clarity | Confirm requirements reflect user needs and mission requirements |
| Design & Development | Design reviews, analysis, simulation, compare outputs to inputs | Prototype testing, demonstration, operational evaluation |
| Production | In-process inspection, testing, SPC, FAI | Process validation, production readiness review, qualification testing |
| Acceptance | Final inspection, acceptance testing, records review | Customer acceptance, field trials, qualification demonstration |
| Sustainment | Inspection, testing, configuration verification | FRACAS, field performance monitoring, reliability growth |
Frequently Asked Questions
What is the difference between Verification and Validation?
Verification answers "Did we build it right?" — it ensures design outputs meet input requirements. Validation answers "Did we build the right thing?" — it ensures the product meets intended use requirements.
Does GJB9001C require both Verification and Validation?
Yes. GJB9001C-2017 Clause 8.3.4 requires both verification (8.3.4.c) and validation (8.3.4.d) as part of design and development control.
Can Verification substitute for Validation?
No. Verification ensures conformance to specifications; Validation ensures mission capability. A product can meet all specifications (verification passed) but fail in the field (validation failed). Both are required.
What is process validation in PCB manufacturing?
Process validation applies to processes where the output cannot be fully verified by subsequent inspection — such as plating, lamination, or soldering. Organizations must demonstrate that the process consistently produces acceptable results.
How does IPC-6012 address Verification and Validation?
IPC-6012 is titled "Qualification and Performance Specification" — qualification is validation (demonstrating mission capability), while performance specifications define verification criteria. IPC-6012 requires both qualification testing (validation) and ongoing conformance testing (verification).
What is the relationship between Verification and First Article Inspection?
First Article Inspection (FAI) under GJB 908 is a validation activity — it validates that the production process can produce products that meet requirements. However, FAI also includes verification elements (checking dimensions, materials, and performance against specifications).
What is the difference between verification testing and validation testing?
Verification testing checks that the product meets specifications — it answers "does it conform?" Validation testing checks that the product performs in intended use conditions — it answers "will it work when it matters?" Validation testing is typically more comprehensive and uses operational or environmental conditions.
Related Standards & Topics
PCB Manufacturing for Military and Aerospace Programs
UltroNiu Electronics Group provides PCB and PCBA manufacturing services with comprehensive verification and validation programs compliant with GJB9001C requirements. Contact our engineering team for program-specific requirements.
Request Engineering ReviewReferences: GJB9001C-2017 (Central Military Commission Equipment Development Department), GB/T 19000-2016 (ISO 9000:2015), GB/T 19001-2016 (ISO 9001:2015). Verification and Validation definitions sourced from GJB9001C-2017 Clause 8.3.4. Process validation requirements sourced from GJB9001C-2017 and associated guidance. IPC-6012E (2020), IPC-A-600, IPC-TM-650. Courtesy of UltroNiu Engineering Knowledge Center.
Get Custom Quote
PRODUCTS CENTER
World-class PCB & PCBA manufacturer focused on high-frequency and high-reliability boards for defense, aerospace, automotive and industrial electronics.
You can unsubscribe at any time with a single click.
Copyright © 2025 UltroNiu Electronics Group All Rights reserved.