Identifying special-causes of variation

Special-causes of variation need to be identified and eliminated from the process.

  1. On the Analyse-it ribbon tab, in the Process Control group, click Labels.
    In the analysis task pane, the Control Chart panel is displayed.
  2. In the Label drop-down list, select Cause.
  3. Click Recalculate.

Points on the control chart are labelled with the reason for the special-cause variation. After discussion of the causes of problems with the team, and increased training, procedures or modifications are put in place to ensure they are eliminated.

Xbar-R control chart(click to enlarge)