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QUALITY IMPROVEMENT
TOOLS AND TECHNIQUES
Statistical Process
Control (SPC) Chart 2
| Definition
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The SPC chart
is a run chart with the additional feature of displaying upper and
lower statistical control limits for a particular process .These control
limits usually represent 3 standard deviations above and below the
mean. |
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| Purpose
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- Look at
random variation in a process and whether the process is in control.
- Determine
what the variation means-is it due to common factors or produced
by special causes?
- Assess whether
a team has gained more control of a process by reducing variation.
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| Procedure
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- Construct
chart as for a run chart.
- Calculate
the control limits according to statistical formula or via computer
program and plot them on the chart.
- Examine
the data for variation in the process.
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