Sustaining Gains: Statistical Process Control

Introduction to the Control phase

Many Six Sigma belts and teams do a good job in the analyze and improve phase. However, the improvements do not sustain over a long period as certain important requirements of the control phase are not met. Typical causes of the failure to sustain improvements are as follows:

  • Inadequate training to operators on the changed process or equipment
  • Validation of improvement for a short period of time and/or small sample sizes
  • Inadequate control plan and/or audits
  • Controls are dependent on people's compliance with the stated precautionary measures
  • Process improvements may be articulated or specially ‘managed’ only to demonstrate to the sponsor or management that the ...

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