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What is a control chart, and how is it used
Control charts are actually one of the seven basic tools of quality control. They are used in conjunction with the histogram, Pareto chart, check sheet, cause and effect diagram, flowchart, and the scatter diagram. A control chart is used to help distinguish process variation due to assignable causes from those that are caused by causes that are out of their control.
In order to use the process chart correctly you will need to plot both types of process variations on the control chart. You want to make sure that you chart all of the causes because your assignable causes, which can also be referred to as special causes, play a huge role in the control chart. These types of processes are not always going to be present, in fact they are not considered normal. The reason for that is that special causes are causes that can be avoided, so if they show up on your control chart you will need to investigate. During your investigation, you will need to determine what you can do to prevent these causes from happening again. The other causes are considered common causes or even chance causes because of the fact that they occur by chance. Like special causes, these types of causes are not always present. Unlike special causes, though these factors are considered normal and are expected during a process because they are unavoidable. Here is a look at the different elements that are going to be present on a control chart:
Here are the steps that you will need to follow to create a control chart. Step three: Step four: Step five: Step six: Other tips:
The one thing that you need to know is that in Six Sigma control charts are considered a necessary tool because of the role that they play. Control charts are used in assessing the nature of variation in a certain process. Not to mention that control charts also monitor existing processes to ensure that they remain stable, as well as help forecast improvement programs.
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