Random variations are variations that may follow a pattern and may be consistent, these are not a controllable variation

Random variations are variations that may follow a pattern and may be consistent, these are not a controllable variation. Non random variation is caused y a special event, such as a tool breaking or loss of air pressure for little moments. These are special and not considered controllable either, as the part will most likely be out of spec. Process charts are used to define the amount of control a process has.
Certain samples are taken at intervals to chart on the graph. The upper limit of measurement and lower limit are charted, this gives us the process control limit. If the limits are within the specification you are off to a good start, as long as variations do not fall out of spec. Thoughts?
Foster, S. T. Managing Quality: Integrating the Supply Chain, 6th Edition. Pearson Learning Solutions, 02/2016. VitalBook file.
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