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The quality of a product can be evaluated partly in terms of the degree to which each of its characteristics meets its corresponding design requirement. In the sense used here, “characteristics” refer to specific design parameters which, in toto, constitute the product definition. A characteristic may be a length, width, surface finish, wall thickness, or any one of numerous drawing features. A characteristic is the smallest measurable or evaluatable element of a drawing. When dealing with a specification, however, (for purposes here) the definition of a characteristic must be altered to that of an individual design parameter such as an internal impedance, minimum amplification, or ability to withstand 5000 psi.