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There are different types of specifications, which generally are mostly types of documents, forms or orders or relates to information in databases. The word ''Specification'' merely refers to the act of "To state explicitly or in detail" or "to be Specific". A specification may refer to a type of technical standard (the main topic of this page). Using the word "specification" without additional information to what kind of specification you refer to is confusing and considered bad practice within systems engineering. A Requirement specification is a set of documented requirements to be satisfied by a material, design, product, or service. A Functional specification is closely related to the requirement specification and may show functional block diagrams. A Design or Product specification describes the features of the solutions for the Requirement Specification, referring to the designed solution or final produced solution. Sometimes the term ''specification'' is here used in connection with a data sheet (or ''spec sheet''). This may be confusing. A data sheet describes the technical characteristics of an item or product as designed and/or produced. It can be published by a manufacturer to help people choose products or to help use the products. A data sheet is not a technical specification as described in this article. A "In-service" or "Maintained as" specification, specifies the conditions of a system or object after years of operation, including the effects of wear and maintenance (configuration changes). Specifications may also refer to technical standards, which may be developed by any of various kinds of organizations, both public and private. Example organization types include a corporation, a consortium (a small group of corporations), a trade association (an industry-wide group of corporations), a national government (including its military, regulatory agencies, and national laboratories and institutes), a professional association (society), a purpose-made standards organization such as ISO, or vendor-neutral developed generic requirements. It is common for one organization to ''refer to'' (''reference'', ''call out'', ''cite'') the standards of another. Voluntary standards may become mandatory if adopted by a government or business contract. ==Use== In engineering, manufacturing, and business, it is vital for suppliers, purchasers, and users of materials, products, or services to understand and agree upon all requirements.〔Gary Blake and Robert W. Bly, ''The Elements of Technical Writing'', pg. 108. New York: Macmillan Publishers, 1993. ISBN 0020130856〕 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. Specifications may be written by government agencies, standards organizations (ASTM, ISO, CEN, DoD, etc.), trade associations, corporations, and others. A product specification does not necessarily prove a product to be correct or useful. An item might be verified to comply with a specification or stamped with a specification number: This does not, by itself, indicate that the item is fit for any particular use. The people who use the item (engineers, trade unions, etc.) or specify the item (building codes, government, industry, etc.) have the responsibility to consider the choice of available specifications, specify the correct one, enforce compliance, and use the item correctly. Validation of suitability is necessary. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Specification (technical standard)」の詳細全文を読む スポンサード リンク
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