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Classification of Standards: 

To maintain accuracy and interchangeability it is necessary that Standards to be traceable to a single source, usually the National Standards of the country, which are further linked to International Standards. The accuracy of National Standards is transferred to working standards through a chain of intermediate standards in a manner given below.  

  1. National Standards 
  2. National Reference Standards 
  3. Working Standards 
  4. Plant Laboratory Reference Standards 
  5. Plant Laboratory Working Standards 
  6. Shop Floor Standards 

Evidently, there is degradation of accuracy in passing from the defining standards to the shop floor standards. The accuracy of particular standard depends on a combination of the number of times it has been compared with a standard in a higher echelon, the frequency of such comparisons, the care with which it was done, and the stability of the particular standards itself. 

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