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==Importance==
Identifying design problems, and solving them as early in the design cycle as possible, is the key to keeping projects on time and within budget. Too often, [[product design]] and performance problems are not detected until late in the [[product development]] cycle — when the product is ready to be shipped. The old adage holds true: It costs a [[Penny (United States coin)|penny]] to make a change in engineering, a [[Dime (United States coin)|dime]] in production and a [[United States dollar|dollar]] after a product is in the field.
In the [[Prototyping]] stage, engineers create actual working samples of the product they plan to produce. Engineering Verification Testing (EVT) is used on prototypes to verify that the design meets pre-determined specifications and design goals. This valuable information is used to validate the design as is, or identify areas that need to be modified.
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