A specification is an explicit set of requirements to be satisfied by a material, product, or service. (ASTM definition) Use of a Specification In engineering, manufacturing, and business, it's vital for suppliers, purchasers, and users of materials, products, or services to understand and agree upon all requirements. A specification is a type of a standard which is often referenced by a contract or procurement document. It provides the necessary details about the specific requirements. Specifi… (More on Specifications)