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lance or the fire department). Enhanced 9-1-1 (or E9-1-1) uses computers and databases to determine
the caller's physical address, directs the call to the nearest PSAP, and displays the caller's phone num-
ber and address to the call taker. Wireless Enhanced 9-1-1 provides call takers with identification in-
formation for wireless calls. Rolled out in two phases, the first phase required carriers to provide the
wireless phone number and the location of the cell site or base station transmitting the call. The sec-
ond phase required carriers to provide the location of the caller (using technologies such as GPS). To
learn more about 9-1-1, visit http://www.fcc.gov/pshs/services/911-services/Welcome.html and
http://people.howstuffworks.com/9-1-1.htm .
An important part of creating a class is determining the class's attributes (instance variables).
For this class design exercise, research 9-1-1 services on the Internet. Then, design a class called
Emergency that might be used in an object-oriented 9-1-1 emergency response system. List the
attributes that an object of this class might use to represent the emergency. For example, the class
might include information on who reported the emergency (including their phone number), the
location of the emergency, the time of the report, the nature of the emergency, the type of response
and the status of the response. The class attributes should completely describe the nature of the
problem and what's happening to resolve that problem.
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