Simplify the following text for a Grade 15 native English-speaking person.
Original: The precise definition of an emergency , the agencies involved and the procedures used , vary by jurisdiction , and this is usually set by the government , whose agencies ( emergency services ) are responsible for emergency planning and management .
Simplified: The exact definition of an emergency , the agencies involved and the rules followed , depend on the jurisdiction , and this is usually set by the government , whose agencies ( emergency services ) are responsible for emergency planning and handling .