Assignable variation | Deviation in the output of a process that can be clearly identified and managed.
|
![](/olcweb/styles/shared/spacer.gif) |
![](/olcweb/styles/shared/spacer.gif) |
![](/olcweb/styles/shared/spacer.gif) |
Attributes | Quality characteristics that are classified as either conforming or not conforming to specification.
|
![](/olcweb/styles/shared/spacer.gif) |
![](/olcweb/styles/shared/spacer.gif) |
![](/olcweb/styles/shared/spacer.gif) |
Capability index (Cpk) | The ratio of the range of values produced by a process divided by the range of values allowed by the design specification.
|
![](/olcweb/styles/shared/spacer.gif) |
![](/olcweb/styles/shared/spacer.gif) |
![](/olcweb/styles/shared/spacer.gif) |
Common variation | Deviation in the output of a process that is random and inherent in the process itself.
|
![](/olcweb/styles/shared/spacer.gif) |
![](/olcweb/styles/shared/spacer.gif) |
![](/olcweb/styles/shared/spacer.gif) |
Statistical process control (SPC) | Techniques for testing a random sample of output from a process to determine whether the process is producing items within a prescribed range.
|
![](/olcweb/styles/shared/spacer.gif) |
![](/olcweb/styles/shared/spacer.gif) |
![](/olcweb/styles/shared/spacer.gif) |
Upper and lower specification or tolerance limits | The range of values in a measure associated with a process that are allowable given the intended use of the product or service.
|
![](/olcweb/styles/shared/spacer.gif) |
![](/olcweb/styles/shared/spacer.gif) |
![](/olcweb/styles/shared/spacer.gif) |
Variables | Quality characteristics that are measured in actual weight, volume, inches, centimeters, or other measure.
|