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| articles:whac-a-mole [2020/12/04 13:20] – [Common Cause vs Special Cause Variation] rrandall | articles:whac-a-mole [2020/12/30 10:26] – [Common Cause vs Special Cause Variation] rrandall |
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| The [[https://support.minitab.com/en-us/minitab/18/help-and-how-to/quality-and-process-improvement/control-charts/supporting-topics/basics/using-control-charts-to-detect-variation-in-a-process/|Minitab® 18 Support web site]] offers the following table as "**Examples of common-cause and special-cause variation**". | The [[https://support.minitab.com/en-us/minitab/18/help-and-how-to/quality-and-process-improvement/control-charts/supporting-topics/basics/using-control-charts-to-detect-variation-in-a-process/|Minitab® 18 Support web site]] offers the following table as "**Examples of common-cause and special-cause variation**". |
| ^ Process ^ Common Cause of Variation ^ Special Cause of Variation ^ | ^ Process ^ Common Cause of Variation ^ Special Cause of Variation ^ |
| | Baking a loaf of bread | The oven's thermostat allows the temperature to drift up and down slightly. | Changing the oven's temperature or opening the oven door during baking can cause the temperature to fluctuate needlessly. | | | Baking a loaf of bread | The [[https://controlguru.com/the-components-of-a-control-loop/|control loop]] in the oven's thermostat allows the temperature to drift up and down slightly. | Changing the oven's temperature or opening the oven door during baking can cause the temperature to fluctuate needlessly. | |
| | Recording customer contact information | An experienced operator makes an occasional error. | An untrained operator new to the job makes numerous data-entry errors. | | | Recording customer contact information | An experienced operator makes an occasional error. | An untrained operator new to the job makes numerous data-entry errors. | |
| | Injection molding of plastic toys | Slight variations in the plastic from a supplier result in minor variations in product strength from batch to batch. | Changing to a less reliable plastic supplier leads to an immediate shift in the strength and consistency of your final product. | | | Injection molding of plastic toys | Slight variations in the plastic from a supplier result in minor variations in product strength from batch to batch. | Changing to a less reliable plastic supplier leads to an immediate shift in the strength and consistency of your final product. | |
