**CONTROL CHARTS **(Variables)

### Why Control Charts

- Understand Process Variation to achieve state of
- Statistical Control
- When Process is in Statistical Control, its performance is predictable
- Further reduction of common causes variation
- Common language for communicating Process performance
- More precise and accurate technique

### How to develop control chart

- Select the Subgroup Size
- Process Variation Detection

- Select Subgroup Frequency
- Detect change in the Process over span of time

- Select No. of Subgroups
- Major source of variation incorporate

Next:- Average Range Control Charts (X̄-R Charts)

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