Or 10 out of 11, 12 out of 14, or 16 out of 20. A run of eight in a row are on the same side of the centerline.Four out of five successive points are on the same side of the centerline and farther than 1 σ from it.Two out of three successive points are on the same side of the centerline and farther than 2 σ from it.In Figure 1, point sixteen is above the UCL (upper control limit). A single point outside the control limits.Document how you investigated, what you learned, the cause and how it was corrected. When one is identified, mark it on the chart and investigate the cause.
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