Reliability Specification The importance of accurate and clearly specified product requirements can not be overstated. The reliability specification is usually part of a larger document, called the product specification or product requirements document. This document contains information such as the product description, performance specifications, environmental requirements, electrical interface specifications, physical specifications and reliability specifications. Because the definition of reliability depends on the various product specifications, including the reliability requirements, it is important that they are well understood and properly stated in the product specification. Nothing should be left to interpretation or to be assumed by the reader, unless it is a legitimate …