Serviceability is concerned with how readily a product can be repaired and the speed, competence, and courtesy associated with that repair. This dimension of quality i sometimes overlooked in the design stage. For example. Chevrolet in the 1970s designed a car in which one of the spark plugs could not be removed without pulling out. the entire engine. The speed of the repair is also important. in that it affects the overall number of products needed for those businesses that require constant coverage. Using a city’s paramedic service as an example, the frequency and the amount of time a paramedic vehicle requires repair and maintenance impact directly on the total number of vehicles the city needs to provide the proper level of coverage.