ABSTRACT
The maintenance of large vehicles (airplanes, trains, and tractors) provides difficult problems for computing devices due both to environmental and human factors. The environment has extremes of temperature and light, dirt and grease are common, and tools such as computers must be very robust. The technicians who perform the maintenance must have the mobility to move around, over, under, and inside the vehicle and must have their hands free much of the time. Maintenance is an activity that is performed both solo and with collaboration and the individuals who perform it tend to have little computer sophistication.
