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The need to attribute disputed utterance constantly arises, sometimes as a matter of legal urgency (contested 'confessions' or other documents), sometimes as the focus of fierce scholarly debate (was that new story just discovered really by D.H. Lawrence? QSUM finds not), sometimes as a popular diversion (whose words were on the 'Royal Tapes'?) It is in such situations that a scientific method of attribution - one which is objective - becomes desirable.;The cumulative sum technique for authorship attribution (Cusum or QSUM, as the analytic procedure is now known) is just such a method. Invented in 1988 by Andre Q. Morton, long recognised as the foremost authority on the subject, QSUM is fully explained with copious illustrations. The technique works cross time and genre, and has already been used to solve several attribution problems. It has obvious uses in legal work, past and present (did Derek Bentley really make that confession? - again, QSUM finds not).