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Summary of Process Capability and Statistical Process Control

In: Business and Management

Submitted By medinatasha
Words 275
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Statistical Process Control is a statistical procedure using control charts to detect and prevent poor quality of production. It is achieved by taking periodic samples from the process and plotting these sample points on a chart to see if the process is within statistical control limits. When a company is about to conduct SPC, they should train the employees on a continuing basis. SPC is a tool individuals can use to monitor production process for the purpose of making improvement. So employees have their own responsibilities for their own operation.
The quality of a product itself can be evaluated using attribute of the product and variable measures. Attribute is a product characteristic that can be evaluated with a discrete response such as texture, color, taste. Variable measure is a product characteristic that is measured on a continuous scale such as length, weight, temperature, or time. Meanwhile, SPC for service process tend to use the quality characteristic and measurement such as customer satisfaction and time.
Control charts are graphs that establish the control limit of a process and to monitor the process to indicate when it is out of control. The quality measures used in attribute control charts are discrete values reflecting a simple decision criterion. P – Chart uses the proportion of defective items in a sample as the sample statistic . C- Chart is used when it’s not possible to compute a proportion defective and the actual number of defects must be used.
Variable control charts are used for continuous variables that can be measured. Range (R-) chart uses the amount of dispersion in a sample. Mean (X-) chart uses the process average of a sample…...

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