The Big Five of Commercial Media After a number of mergers and acquisitions five powerful media conglomerates lead the world's content production and distribution. They operate on an international basis with subsidiaries all around the globe and engage in every imaginable kind of media industry. Table: The World's Leading Media Companies Media Company 1998 Revenues (in US$) Property/Corporate Information AOL Time Warner (US) 26,838.000.000* http://www.timewarner.com/corp/about/timewarnerinc/corporate/index.html Disney (US) 22,976.000.000 http://www.disney.com Bertelsmann (GER) 16,389.000.000 http://www.bertelsmann.com/facts/report/report.cfm News Corporation (AUS) 12,841.000.000 http://www.newscorp.com/public/cor/cor_m.htm Viacom (US) 12,100.000.000 http://www.viacom.com/global.tin (* Revenues of Time Warner only (merger with AOL took place in January 2000)

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Expert system Expert systems are advanced computer programs that mimic the knowledge and reasoning capabilities of an expert in a particular discipline. Their creators strive to clone the expertise of one or several human specialists to develop a tool that can be used by the layman to solve difficult or ambiguous problems. Expert systems differ from conventional computer programs as they combine facts with rules that state relations between the facts to achieve a crude form of reasoning analogous to artificial intelligence. The three main elements of expert systems are: (1) an interface which allows interaction between the system and the user, (2) a database (also called the knowledge base) which consists of axioms and rules, and (3) the inference engine, a computer program that executes the inference-making process. The disadvantage of rule-based expert systems is that they cannot handle unanticipated events, as every condition that may be encountered must be described by a rule. They also remain limited to narrow problem domains such as troubleshooting malfunctioning equipment or medical image interpretation, but still have the advantage of being much lower in costs compared with paying an expert or a team of specialists.

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