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The '''Joint Academic Coding System''' (JACS) system is used by the [[Higher Education Statistics Agency]] (HESA) and the [[Universities and Colleges Admissions Service]] (UCAS) in the [[United Kingdom]] to classify academic subjects. It is due to be replaced by the Higher Education Coding System (HECoS) and the Common Aggregation Hierarchy (CAH) for the 2019/20 academic year.<ref name=farewell>{{cite web|url=https://www.hesa.ac.uk/blog/28-04-2017/farewell-jacs-and-hello-hecos|title=Farewell to JACS, and hello to HECoS|publisher=HESA|date=27 April 2017|accessdate=10 May 2017}}</ref>
A JACS code for a single subject consists of a letter and three numbers. The letter represents the broad subject classification, e.g. F for physical sciences. The first number represents the principal subject area, e.g. F3 for physics, and subsequent numbers represent further details, similar to the [[Dewey Decimal Classification|Dewey Decimal System]]. The principal subject of physics, for example, is broken into 19 detailed subjects, represented by a letter plus three numbers: e.g., F300 repents physics, F330 environmental physics and F331 atmospheric physics.
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