d in the past. A disadvantage is the potential for dramatic and widespread failures; for as has happened. The downside of this technology is the potential for security problems. Intruders can see packets traveling on a network and can perhaps interpret them to obtain confidential information. Computer technology has had a significant impact on retail stores. All but the smallest shops have replaced the old-fashioned cash register with a terminal linked to a computer system. The terminal may require that the clerk type in the code for the item; but more and more frequently the checkout counter include a bar-code scanner, a device that directly reads into the computer the UPC printed on each package. Cash-register receipts can then include brief descriptions of the items purchased, and the purchase information is also relayed back to the computer to cause and immediate adjustment in the inventory data. The inventory system can easily alert the manager when the supply of some item drops below a specified threshold. In the case of retail chains linked by networks, the order for a new supply of an item may be automatically generated and sent electronically to the supply warehouse. In a less extensively automated arrangement, the manager can send in the order electronically by a dial-up link to the suppliers computer. These developments have made shopping much more convenient. The checkout process is faster; checkout lines shorter; and the desired item are more likely to be in stock. Computer technology has been incorporated into automobiles. Computers are involved (CAD systems) not only the design of cars but also in the manufacturing and testing process, perhaps making use of CIM technology. Todays automobiles themselves include numerous computer chips that analyze sensor data and alert the driver to actual and potential malfunctions. Although increased reliability has been achieved by implementing such computerization, a drawback is that o...
