When many people think of manufacturing, they picture a large plant where hundreds to thousands of workers queue up in a line to punch in for their shift. While these factories do exist, they are few and belong to a select group with customer bases large enough to support such massive productions. Instead, most manufacturing companies operate at smaller scales with less standardization. In emergency equipment manufacturing, for example, a company may produce a small number of ambulance bodies at a time, and these bodies may be attached to truck chassis from different manufacturers with different mounting points and fastener sizes in the same production run