The original form of Goodhart's law arose in economics. According to the 99th edition of Pears Cyclopaedia (1990--1, pp. G 27, G31), the law states that
Professor Charles Goodhart FBA was Chief Adviser to the Bank of England. The Bank used to have a web page about him at www.bankofengland.co.uk/cvs/goodhart.htm, giving his own statement of the law, as published in his book Monetary Theory and Practice, page 96:
Professor Marilyn Strathern FBA, following Hoskin (1996, see below), has re-stated Goodhart's Law more succinctly and more generally:
See also the extended discussion by Keith Hoskin (1996) (The `awful idea of accountability': inscribing people into the measurement of objects), in R. Munro and J. Mouritsen (eds.), Accountability: Power, ethos and the technologies of managing, London, International Thomson Business Press, 265-282. Hoskin's article illustrates the wide applicability of Goodhart's law, and provides an illuminating historical discussion of what `accountability' has come to mean today. Strathern's discussion appears in her 1997 article `Improving Ratings': Audit in the British University System, European Review 5, 305-321.