How To Avoid Large Scale Product Quality Issues?

There are three different validation tests that a product needs to perform before it goes into mass production: Engineering Validation Test (EVT), Design Validation Test (DVT), and Production Validation Test (PVT). Investing in the EVT, DVT, and PVT process can largely help avoid large-scale product quality issues.

Many companies simply assume that once they have a working prototype / MVP (Minimum Viable Product) and a sufficiently comprehensive Product Requirements Document (PRD), they can go straight to mass production.

However, without proper verification procedures, your product could be recalled in the future, which could cost your company as much as $10 million to over $100 million.

There are three different validation tests that a product needs to perform before it goes into mass production:

1. Engineering Validation Test (EVT),
2. Design Validation Test (DVT),
3. Production Validation Test (PVT).

EVT (Engineering Validation Test) 

Number of EVT (Engineering Validation Test): 10-50
Duration of EVT (Engineering Validation Test): 4-6 weeks
Purposes of EVT (Engineering Validation Test): Validate all features and functions are operational.

Many products have just been designed as engineering prototypes, and it is necessary to correct possible design problems one by one, focusing on considering the design integrity and whether any specifications are missing, including functional and safety tests.

EVT (Engineering Validation Test) checks that your product meets all functional, performance, and reliability requirements listed in the PRD (eg 4 hours of battery life, 15Hz – 25kHz frequency response).

The main purpose of EVT (Engineering Validation Test) is to obtain a product sample that meets all expected results and specifications.

DVT (Design Validation Test)

Number of DVT (Design Validation Test): 50-100 units
DVT (Design Validation Test) Duration: 4 weeks
Purposes of DVT (Design Validation Test): Correct the problematic design

In DVT, all designs are complete and the focus is on identifying design issues and making sure all designs are within specification. Verified by R&D and DQA (Design Quality Assurance), the product is basically finalized at this time.

This stage is closely related to the regulatory certification (e.g. RoHS, FCC, UL) for the sale of your product. As such, these tests focus on building the product consistently and reliably. These prototype units will undergo rigorous stress tests (eg, falls from 1.2m heights, burning, submersion in water, extensive battery testing, etc.) to check their durability, stability, and product longevity. User groups can also be used to test whether a product meets customer expectations.

PVT (Production Validation Test)

Number of PVT (Production Validation Test): 1000 Pieces
PVT (Production Validation Test) Duration: 2 weeks – 2 months
Purposes of PVT (Production Validation Test): Reach mass production efficiency 

At this stage, all product designs have been completed, and the final step is to verify before mass production to ensure that the factory has the means to make the originally designed products according to the standard procedures.

Before entering mass production, it is important to conduct a trial run of the production line to assess quality assurance (QA) and quality control (QC). PVT (Production Validation Test) is designed to optimize your mass production process, ensuring that the product is produced at the correct quantity, cost, and quality, thus testing the entire mass production speed.

Products produced during these test periods, if they meet all requirements, can be planned for sale to customers and will be considered part of your first production run. If a fault is found, this will be your last chance to adjust the tooling before mass production.

It takes a lot of time and effort to develop the product, therefore, investing in the EVT (Engineering Validation Test), DVT (Design Validation Test), and PVT (Production Validation Test) processes can largely help avoid large-scale product quality issues.

Learn More: 

LKKER SCM NPI Project Management Service 

LKKER SCM Turnkey Design Service 


Relevant Blogs: 

Six stages of IoT (Internet of Things) product development

The Workflow of EVT, DVT and PVT

Introduction To NPI (New Product Introduction)


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