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What does it do?  | The I-MR chart is a tool to help you determine if your process is in control by seeing if special causes are present |
Why Use? 
| The presence of special cause variation indicates that factors are influencing the output of your process. Eliminating the influence of these factors will improve the performance of your process and bring your process into control |
When Use? 
| The Measure phase to separate common causes of variation from special causesThe Analyze and Improve phases to ensure process stability before completing a hypothesis testThe Control phase to verify that the process remains in control after the sources of special cause variation have been removed |
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