Statistical Process Control (SPC) helps ensure that the solution created is maintained over time. By using these tools, your process can remain in control.

## Statistical Process Control and Stability of Process

Predictable process vs unpredictable.

**Predictable:** variation coming from common cause variation – or variation inherent to the environment of the process.

**Unpredictable:** special cause variation exists.

## Additional Statistical Process Control Resources

**Specification Limits:** Voice of the Customer. Shows what they will accept – or won’t/

Great decision matrix here: https://www.moresteam.com/toolbox/statistical-process-control-spc.cfm

## Statistical Process Control Videos

## Six Sigma Green Belt Statistical Process Control Questions

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**Question:** In the Control Phase of a LSS project a Belt will identify key metrics that can be monitored and analyzed to give an indication that a process may be moving towards an out of spec condition. When he applies this approach he is using __________________.

(A) Poisson Derivatives

(B) Inferential Statistics

(C) Kanban Analysis

(D) Statistical Process Control

**Question:** Statistical process control (SPC) is best defined as the use of

(A) Pareto charts to understand and control a process

(B) inputs to control critical and complex processes

(C) statistical methods to identify and remove manufacturing errors

(D) statistical methods to understand and control a process

## Comments (4)

How to conduct SPC FOR BATCH ORDER TYPE PRODUCTION?

Try making a control chart depending on what your quality measures are.

Could you direct me to the AIAG information you mentioned in the control phase quiz? I followed the link provided but do not see the answer. I tried searching in the search bar but no results.

Larry, you don’t really need the Automotive Industry Action Group (AIAG) information. By definition out of control could be considered a certain number of points in a row on one side of the X Bar Bar or R in a control chart or a certain number of points in a row that are consistently increasing or decreasing.

I’ve seen some standards list 5 points and others list 7. The key to the question is knowing that a process shift or trend has begun if you see that behavior emerged.

I’ve updated the answer walkthrough with this.

You can find AIAG’s PDF on Academia.com here: https://www.academia.edu/7829906/AIAG_Statistical_Process_Control_SPC_2nd_Edition