Control Phase (DMAIC)


Control (by Faramarz Hashemi)


The Control phase is the last section of a DMAIC process. Here we want to make sure that we are prepared for implementing whatever changes we have decided on for the new process, we’ve positioned the new process for success, and that we have successfully transitioned all responsibilities to the new owner.

Control Phase Outputs

  • Comparisons: Before & after
    • baseline sigma and new sigma
    • Especially needed when
      • There was a shift (8 data points above/below historic mean)
      • New process replaces old one permanently.
      • But wait to do so until you have 24 data points.
  • Control Plan & Response Plan
    • Details of implementation.
      • Remember, variation is still the enemy! We want to make sure that any new process documentation is clear, easy to follow, and written in the language of the people adopting it so no new variations creep in.
      • New process must be easily repeatable & reproducible.
      • Write it with a brand new user in mind.
    • Benefits of using the new process
    • Any for-seen difficulties and how to account for them
      • Focus on any causal factors that might disrupt new process.
    • New standardized process.
    • Practices to keep the new process in control. Ex. Measuring plan, Control chart.
  • Project documentation
    • All tollgate materials
    • Sponsor sign off
      • Everyone must agree the charter was completed and the project goals met.
    • Summation of results & impact.
    • Document lessons learned.
      • Good questions to ask:
        • How effective was the data used?
        • How confident are we that the process we used to come up with the solutions is repeatable?
        • How confident are we that the new process will have lasting success?
    • Summarize future plans.
      • Future data collection.
        • How did actual implementation data compare to what was forecast? Did we get the improvements we were after?
    • Communicate to everyone involved in the project – it’s time to celebrate!




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