Physics and Astronomy Classification Scheme

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The Physics and Astronomy Classification Scheme (PACS) is a scheme developed in 1970[1] by the American Institute of Physics (AIP) for classifying scientific literature using a hierarchical set of codes.[2] PACS has been used by over 160 international journals,[1] including the Physical Review series since 1975. Since 2016, American Physical Society introduced the PhySH (Physics Subject Headings) system instead of PACS.


AIP has announced that PACS 2010 will be the final version, but it will continue to be available through their website.[1] The decision was made to discontinue PACS, owing to the administrative complexity of the revision process and its future viability in light of changing technological and research trends. However, PACS is still in use by scientific journals.[3]

In association with Access Innovations, Inc., the AIP has developed a new "AIP Thesaurus",[4] which it states will enable faster, more accurate and more efficient searches.

See also[edit]


  1. ^ a b c "PACS home page". AIP Website. AIP. Retrieved 10 April 2013. 
  2. ^ "What is PACS?". AIP Website. AIP. Archived from the original on 22 November 2013. Retrieved 10 April 2013. 
  3. ^ PACS cloud. Reports on Progress in Physics. 2013. (scroll to the bottom of the page)
  4. ^ "Access Innovations, Inc. and American Institute of Physics "Unravel" New Thesaurus for Online Scholarly Publications". Access Innovations Website. Access Innovations. Retrieved 10 April 2013. 

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