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self-intersecting shape outline problem. In that circumstance, the software calculated radiation doses that were too high by margins of 20 percent to 100 percent. Because the problem only manifested itself with certain combinations of blocks, and with certain data input practices of individual operators, the cause of the few overexposures (the hospital treated about 100 people per day) was difficult to determine. You can read a more complete account of the accidents and the investigation in an eWEEK article from March 2004 at http://www.findarticles.com/p/articles/mi_zdewk/is_200403/ai_ziff121063. In 1991 during the first Gulf War, a software anomaly caused a Patriot missile battery protecting a barracks of the US Army in Dhahran, Saudi Arabia to fail to fire at an incoming Iraqi Scud missile, even though the system detected the missile en route. Twenty-eight soldiers died. The cause of the Patriot missile s battery failure turned out to be an obscure software bug related to truncation of a variable used to keep time. The Information Management and Technology Division of the US General Accounting Office provided a complete report (http://www.fas.org/spp/starwars/gao/im92026.htm). Originally the Patriot missile was designed to operate against aircraft and cruise missiles. It is a mobile system designed to be set up in a location and operated for a few hours at a time before moving again. The system was adapted to attack faster short-range ballistic missiles. To avoid firing the Patriot battery at false alarms, the software controlling the battery would confirm the presence of an incoming missile by predicting the incoming missile s future position based on the battery s early detection of the missile target. To compute the predicted position of the enemy missile, the Patriot battery relied on highly accurate time-keeping to focus the attention of its radar on a range gate. If the incoming missile were again detected in the range gate at the predicted time, the Patriot battery concluded that the incoming missile was real, and automatically launched its attack. The problem discovered in the tragic Dhahran incident was that the time-keeping variable used in the Patriot software lacked sufficient precision, and this resulted in truncation of the time measurement. That truncation slowly accumulated a difference between actual and computed time. In Dhahran, the missile battery had been in place for over 100 hours, and the time difference had accumulated to 0.34 seconds. Since the Scud was moving fast, the Patriot battery miscalculated the predicted position of the Scud by about a half mile. As a result, the battery did not detect the incoming missile in its range gate, and so concluded that no attack was in progress. The battery sat silent as the Iraqi missile killed the US soldiers. Such subtle problems in software illustrate the tremendous challenge, and the tremendous responsibility, developers have to create and test their programs and systems. As someone observed, in most states you need a license to cut hair, but not to write software, even for medical and military systems! Computing professionals must shoulder their ethical burden and use every means at their disposal to insure their systems are correctly specified and implemented. Testing is important, but it is not enough. Any system of reasonable complexity will be impossible to test exhaustively. Many authorities have made this point. For example, Jeffrey Voas of the Defense Advanced Research Projects Agency (1998, http://www.stsc.hill.af.mil/crosstalk/1998/11/voas.asp) cites, the many practical and theoretical deficiencies of software testing. In addition to testing, developers need to use best practices throughout specification and creation of their systems, and to perform their work with the utmost conscientiousness. The ACM Code of Ethics again provides guidance: 1.2 Avoid harm to others... computing professionals must minimize malfunctions by following generally accepted standards for system design and testing... 2.1 Strive to achieve the highest quality, effectiveness... in both the process and products of professional work. 2.2 Acquire and maintain professional competence. 2.5 Give comprehensive and thorough evaluations of computer systems and their impacts, including analysis of possible risks... Computer professionals are in a position of special trust, and therefore have a special responsibility to provide objective, credible evaluations to employers, clients, users, and the public... Any signs of danger from systems must be reported to those who have opportunity and/or responsibility to resolve them... SUMMARY Ethics is the rational study of different moral systems. We described very briefly some of the different ethical theories, and then introduced the ACM Code of Ethics, developed to guide the behavior of people in the computing industry.
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