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Shewhart) or process-behavior charts, are a statistical process control tool used to determine if a manufacturing or business process is in a state of control. It is more appropriate to say that the control charts are the graphical device for Statistical Process Monitoring (SPM).

SPC is a tool that will help you understand the scale of any problem (the degree of variation) and identify possible causes when used with other investigative tools, e.g. process mapping. You are then able to measure the impact of any improvement: does it cause more variation?

The C chart plots the number of defects (also called nonconformities) per subgroup when subgroup sizes are equal. It is possible for an item to have one or more defects but still be acceptable in function and performance. The center line represents the mean number of defects per subgroup.

A standard deviation control chart monitors process variation, as measured by the standard deviation of observations, through subgroups collected over a period of time. Typically, three lines are depicted on a control chartthe centerline (CL), the upper control limit (UCL), and the lower control limit (LCL).

How to calculate upper control limit (UCL)? Upper control limit formulaThe upper control limit formula: UCL = x - (-L 03c3)The lower control limit formula: LCL = x - (L 03c3)

How do you Create a c ChartDetermine the subgroup size.Count the number of defects in each sample.Compute centreline c0305 = total number of defects / number of samples =03a3c/k.Calculate upper control limit (UCL) and low control limit (LCL).More items...

Types of Control ChartsX-Chart. X-Charts present variable data.P-Chart. P-Charts are used for data that is counted.NP-Chart. NP-Charts are used to present the number of nonconforming or conforming items.C-Chart.U-Chart.MR-Chart.Individual MR-Chart.Custom Data Control Chart.