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SPC is used
to identify and track variation in processes. All process will have some natural
variation. Think about it this way: Let??™s say you get into your car and drive to work
every weekday. What can vary about that? Well, assuming that you don??™t change
the route you take, the natural variation can be the number of stoplights you hit
(that means the lights you must stop at??”not that you hit them with your car), the
number of cars waiting at the stoplight, the number of cars that are making turns at
the stoplight, and so on. It can also include the number of accidents (if accidents are
a normal part of your drive into work), the number of school buses you get behind,
and on a really good day when everything seems to irritate you, the number of trash
trucks you follow that you just can??™t seem to pass. All of these frustrations are those
that you currently, normally encounter on your way to work. While the number
of trash trucks may change, and the number of cars turning may change, the basic
process of driving to work has not changed.


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