Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.A specification is an explicit set of requirements to be satisfied by a material, product, or service. Should a material, product or service fail to meet one or more of the applicable specifications, it may be referred to as being out of specification; the abbreviation OOS may also be used. A technical specification may be developed privately, for example by a corporation, regulatory body, military, etc: It is usually under the umbrella of a quality management system. They can also be developed by standards organizations which often have more diverse input and usually develop voluntary standards: these might become mandatory if adopted by a government, business contract, etc.