Control chart

Another very useful analysis option during the control phase and beyond is provided by a control chart. This enables you to identify at a glance whether or not the existing process fluctuations are staying within set limits. It represents the average, maximum and minimum value of a process graphically.

To do this, create a control diagram for the process cycle time as described in chapter Evaluating PPM data in Minitab®.

Procedure

  1. Display the Process mining analysis for the process cycle time described in the chapter on Process mining.
  2. Start the Minitab® application from >_ppm>.
    1. Display the Plug-ins tab bar.
    2. Click button_start_program Start Minitab® without macro in the tab bar.
  3. In Minitab®, create a control chart by selecting Stat > Control Chart in the main menu.

    A control chart is displayed based on your settings.

  4. Create a macro for the Minitab® evaluation and assign it to the current analysis in PPM.

    See also chapter Assign a Minitab® macro to the PPM analysis.

  5. Save the current settings as a separate favorite.

You can then use the favorite to easily start the Minitab® evaluation again from PPM.

Example: Control chart for process cycle time

s_ppm_sixsigma_MT_controlchart