Statistical Process Control

1. Introduction to Statistical Process Control

4. Ensuring successful delivery An essential element of producing a high quality product or service is insuring that the characteristics of that product remain constant over time. Product quality is directly dependent on the process capability. Two key process requirements are – Capability and Stability SPC charts are widely used to determine whether a process is capable and stable over time. Process Inputs Outputs

5. Understanding Control Charts Control charts are graphical representation of product / process performance over time with Control Limits. It may or may not have Specification limits. They are widely used to determine whether a process is capable and stable over time. Control Limit – The actual performance of the process Specification Limits – What the process is required to perform Capable – Process Performance well within Specification Limits Stable – Process does not have special causes and have no trends/cycles

6. Creating SPC Charts Central Line or Process Average CL UCL LCL x + 3  - 3  TIME y Upper Control Limit Lower Control Limit UCL = Process Average + 3 Standard Deviations LCL = Process Average - 3 Standard Deviations Unacceptable Deviation, beyond control limits

7. Is this process good enough?

8. Is this process good enough?

9. Is this process good enough?

10. Is this process stable?

11. Is this process stable?

12. Is this process stable?

13. Is this process stable?

16. Any Questions?