Critics
Robert Hahn and Scott Wallsten of the American Enterprise Institute wrote a paper in November 2003 directly criticising the Bessen/Hunt technique. Bessen and Hunt wrote a reply in 2004.
A 2006 paper by Michael Noel and Mark Schankerman of the London School of Economics and Political Science also mentions the Bessen/Hunt technique and suggests that keyword searching can be difficult since many patent applications may contain the word software or other related words but not be primarily about software itself. Noel and Schankerman instead define a software patent as any patent classified by the (European) Patent Office in International Patent Classication G06F ('Electric Digital Data Processing').
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