Testing and Refinement 

The level of activity during this stage is dictated by the requirements of the product.

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A high volume consumer product requires extensive testing and possibly field trial testing.  At the other extreme, a proof of concept product may require little refinement but is used to demonstrate the product's potential.

• Prototype Fabrication

• Integration Testing

• Regulatory Testing

• Product Documentation

"Strive for perfection in everything. Take the best that exists and make it better. If it doesn't exist, create it.  Accept nothing nearly right or good enough" - Sir Henry Royce