The Service Company
To a degree, all service companies suffer from inefficient deployment of the workforce. Almost all start the day with a schedule, but it is constantly revised and updated. There are many causes for falling off schedule, but the only certainty is that the situation is fluid.
In almost all circumstances, service companies have a central dispatch. Mobile service staff maintain contact with the central office via radio or phone so, at best, dispatchers know when something is done, but rarely know where their workforce are at any given time.
A solution could be a PDA phone device connected to a GPS system. When in the vehicle, the system could transmit its GPS coordinates to a central office. Dispatchers would then monitor a moving map display of their service vehicles locations and be able to route and assign them efficiently and quickly. This would lead to much more efficient use of resources as well as providing a vastly improved service.