SPC was pioneered by Walter A. Shewhart at Bell Laboratories in the 1920s and later championed by W. Edwards Deming. The central philosophy is simple:
The primary goal of SPC is to achieve process stability. It differentiates between two types of variation:
While SPC includes histograms, Pareto charts, and cause-and-effect diagrams, the centerpiece is the (Shewhart chart). A good PDF will explain:
If hour 13 has an average weight of 508g, this is above the UCL of 505.9g. This signals a Special Cause . You stop the line, investigate, and find the hopper was running low.
SPC was pioneered by Walter A. Shewhart at Bell Laboratories in the 1920s and later championed by W. Edwards Deming. The central philosophy is simple:
The primary goal of SPC is to achieve process stability. It differentiates between two types of variation:
While SPC includes histograms, Pareto charts, and cause-and-effect diagrams, the centerpiece is the (Shewhart chart). A good PDF will explain:
If hour 13 has an average weight of 508g, this is above the UCL of 505.9g. This signals a Special Cause . You stop the line, investigate, and find the hopper was running low.