|
|
|
Control Chart: When to use it
The Quality Toolbook >
Control Chart > When to use it
When to use it | How to understand it |
Example | How to do it | Practical
variations
<-- Previous | Next -->
When to use it
- Use when investigating a process, to determine whether it is in a state of statistical control and thus whether actions are required to bring the process under control.
- Use it to differentiate between special and common causes of variation, identifying the special causes which need to be addressed first.
- Use it to detect statistically significant trends in measurements; for example, to identify when and by how much a change to the process has improved it.
- Use it as an ongoing 'health' measure of a process, to help spot problems before they become significant.
- It is only practical to use it when regular measurements of a process can be made. Typically this is in processes that repeat within a reasonably short space of time.
Fig. 1. Using the Control Chart in problem solving
<-- Previous | Next -->
|
|
|
|
