Resumen
The invention of the movable type printing press launched the information age by making the mass distribution of information both feasible and economical. Newspaper, magazines, shopping catalogs, restaurant guides and classified advertisements can trace their origins to the printing process. Five and a half centuries of technological progress in communications networks, protocols, computers and user interface design led to the Web, online publishing and e-commerce. Consumers and business have access to vast stores of information. all this information, however, used to be accessible only while users were tethered to a computer at home or in an office. Wireless data and voice access to this vast store allows unprecedented access to information from any location at any time. The presentation of this information must be tailored to the constraints of mobile devices. Although browsing and searching are the acceptable methods of locating information on the wired Web, those operations soon become cumbersome and inefficient in the wireless setting and nearly impossible in voices interfaces. Small screens, slower connections, high latency, limited input capabilities and the serial nature of voices interfaces present new challenges.