A standard (or "specification") attempts to assure consistency and compatibility among similar products or processes.
Standards are usually written by government bodies, professional/industrial organizations, or business; thus some standards are government-mandated while others are voluntary.
Use these sites to identify standards organizations or agencies:
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A standards citation is generally composed of three parts: (1) the sponsoring agency's name or a code, (2) an identifying publication number, and (3) the year adopted or re-affirmed (often only the last two digits). Examples: