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The goal of SPC is to do three things:
1. Determine if a process is in "control".
If a process is in "control", we can know it will do the same thing over and over again, reliably. Every system produces natural variation and by measuring the variation, we can see if the process is in control and reliable.
2. Determine if a process within specification.
Since every process has natural variation, how do we know that, on average, the process is doing what we want?. SPC gives us some tools to use that tells us what the average results will be, and what the high and low variation from average will be (as long as the process stays in "control").
3. Identify reasons for variation.
Once a system is working reliably (is in control), we can look at the natural variation it produces, and decide what causes the variation. Actually, SPC doesn’t tell us what causes the variation, but it gives us clues about where to look. SPC can tell us if variation has "Special" causes (a part of the system is slipping away from specifications) or "System" causes (the system itself must be changed to reduce variation).
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